S358 Product Manual of Portable Digital Voice Amplifier

2024-03-15 17:07:27 诺为

Download the PDF format of this manual:

Norwii Wireless PresenterS358+S128 Wireless Version 4000mAh User Manual 2024-03-15.pdf

Norwii Wireless PresenterS358 Wired Version 4000mAh User Manual 2024-03-15.pdf

Norwii Wireless PresenterS358 Wired Version 2000mAh User Manual 2024-03-15.pdf

Welcome to use digital voice amplifier S358 series, its capacity of lithium batteries can reach to 4000mAh. With double endurance and long standby capacity, it’s suitable for teaching, meeting, training, tour guide, singing, square dance, sales promotion, outdoor activities, etc. Please read the manual carefully before using, so that you can operate the voice amplifier correctly and get ideal performance.

Product functional features:

1.This amplifier has wired and UHF wireless versions. The wired version has no UHF receiving circuit and cannot be used as a wireless version. The wireless version has a UHF wireless receiving circuit, which can achieve wireless amplification with the UHF wireless transmitter.

2.Wired version has 2000mAh or 4000mAh built-in lithium battery separately; and UHF wireless version has 2000mAh or 4000mAh built-in lithium battery separately.

3.With digital amplification technology, its rated power is 5W and max power is up to 10W.

4.High performance double NdFeB foam edge loudspeaker, with clear acoustic fidelity, loud voice and high sensitivity.

5.Equipped with mainstream TYPE-C USB interface, it can be charged with 5V mobile phone charger and computer USB port.

6.Dial volume switch, simple and fast volume control.

7.Support AUX-in, support MP3, WMA, WAV files.

8.Exquisite and fashionable appearance design, comfortable feel, simple function, simple operation, easy portability such as hanging on shoulder or waist.

Function map:

Voice Amplifier


Norwii Wireless Presenter

UHF Wireless Transmitter


(S358 UHF voice amplifier only)

Norwii Wireless Presenter

Keys and Ports instruction:

Norwii Wireless Presenter


In Standby mode, insert microphone to 3.5mm microphone interface to amplify.

Norwii Wireless Presenter

Aux-in3.5mm audio interface, support music play, insert audio cable to play music automatically.

Norwii Wireless Presenter

Pair keyLong press Pair key, you can connect the UHF wireless transmitter, and the UHF wireless amplification can be achieved after the pairing is successful. For wired version, this key has no function ,no silk print.

Norwii Wireless Presenter

TYPE C Charging


Charging port supports charging through 5V mobile phone charger and computer USB port.

Norwii Wireless Presenter

Dial Volume Switch

Rotating the dial can switch on/off the amplifier and adjust the volume. Rotate the switch clockwise (pull right) to turn on the amplifier and increase volume, rotate the switch counterclockwise (pull left) to decrease volume till turn off the power.  

Operation description:

1.Power switch of the voice amplifier:

Pull right the switch clockwise, turn on the amplifier when you hear a "click" and the indicator becomes on. Pull left the switch counterclockwise, turn off the amplifier when you hear a "click" and the indicator becomes off.

2.Volume control of the voice amplifier: 

Rotate the volume dial to adjust the volume. Pull right the button clockwise to increase the volume and pull left the button counterclockwise to decrease the volume.

3.Wired microphone voice amplification:

Please wear a wired microphone, properly adjust the microphone position, and keep at least 50cm away from the amplifier to avoid whistling. Then plug the audio plug of the wired microphone into the MIC interface of the voice amplifier, and the voice can be amplified at this time.

4.Pairing operation between UHF wireless voice amplifier and UHF wireless transmitter:

The product has been paired before leaving the factory. It is not necessary to pair again, but it can be used for wireless sound reinforcement. If it is necessary to pair again according to the actual situation.

Take the pairing operation of the voice amplifier and the S128 UHF Wireless microphone as an example:

  • Turn on the power switch of the voice amplifier, and long press the code matching key Norwii Wireless Presenter of the voice amplifier for 3 seconds. When the red indicator turns into the yellow indicator, it indicates that the code is waiting for matching.

  • After turning the power switch of S128 transmitter to the "ON" power on state, press the side volume "+" key and the volume "-" key at the same time, the blue indicator will flash three times for signal transmission, and the yellow indicator of the voice amplifier will flash three times and become a red indicator, indicating that the voice amplifier and S128 transmitter have been paired successfully. At this time, voice amplifier can be used, and the voice amplifier can be adjusted through "+" and "-".

  • If the voice prompts pairing failure, you can repeat the above two pairing operations.

  • Tips: This operation process is limited to wireless version only.

5.Aux mode of the voice amplifier: 

Connect the voice amplifier with computers, mobile phones, PAD, MP3,MP4 and other devices through the 3.5mm AUX audio cable to play audio, it can be used as external speaker at this time.

6.Low battery power of the voice amplifier:

When the red LED of the voice amplifier flashes, it means the power is low. Please charge the voice amplifier.

7.Voice amplifier charging:

It starts to be charged through USB-C cable when you connect it with computer, a 5V mobile phone charger, or a mobile power supply device etc. The indicator flash at the speed of 1 time/second when it’s being charged. The indicator is always lighting when it’s 80% charged.  It will be full of charge if you continue to charge one more hour. When the indicator flash quickly which shows that the battery power is low, please charge it. It takes about 4-6 hours to fully charge it.

8.Power switch of the S128 transmitter:

Push the S128 transmitter switch to "ON" to turn on the power, and the blue indicator lights up. Push the switch to "OFF" to turn off the power, and the blue indicator lights off.

9.Volume control of the S128 transmitter:

Press the "+" key to increase the voice amplification volume, and press the "-" key to decrease the voice amplification volume.

10.S128 transmitter voice amplification:

Put the S128 transmitter on your head directly and adjust the microphone of the S128 transmitter to aim at your mouth, about 5mm away from your mouth. At this time, you can directly amplify your voice and adjust the amount of voice.

11.Low battery power of the S128 transmitter:

When the blue LED of the transmitter flashes, it means the power is low. Please charge the transmitter.

12.S128 transmitter charging:

When charging, insert one end of the USB-C data cable into the USB-C connector of the transmitter, and connect the other end to the phone charger or computer USB port to charge. The red charging indicator is always on when the power is off, and the red indicator is automatically off when the battery is fully charged; The purple indicator light for charging is always on when the machine is turned on, and the purple indicator light for full charge becomes blue.

Tips and cautions:

1.The microphone is placed 0.5 to 1 centimeter in front of your mouth. It is suggested that the sponge cover should not be removed, because the sponge cover can weaken the air flow, reduce the noise, and make the voice be clear.

2.Microphone should not be close to the voice amplifier, and it’s better if place the amplifier against the microphone. If howling occurs you can reduce the volume appropriately or enlarge the distance between the microphone and the amplifier. The microphone pickup head should not be grasped by hand, otherwise it will be easily howling because of resonance.

3.The product only supports standard 5V charging and does not support all kinds of QC quick charging. Charging with a voltage higher than 5V will burn the product or fail to charge.

4.When you use it for the first time, or after a long time before you use it again, please keep the amplifier be fully charged to ensure battery life.

5.In order to avoid distortion or damage caused by excessive voltage or current, please do not insert the external sound source signal into the MIC interface.

6.Please don’t disassemble, or repair it by non-professional technical personnel. If there are any problems, please contact our company for after sale service.

7.In order to prevent the danger of short-circuiting, please keep products or accessories away from water, moisture, rain or splash.

8.Do not use it in inflammable and explosive areas or in areas where radio equipment is prohibited. When you entering dangerous areas or prohibited areas, power should be turned off to avoid potential safety hazards.

9.Do not use it in high temperature, high pressure and high humidity environment (such as sunshine exposure, stove, heater, humidifier, water pool, etc.). Do not place it or close to dangerous sources (fire source, liquid, explosive, high-speed machinery, etc.) in order to avoid damage and danger.

10.In order to protect the environment, please put the discarded amplifier in the designated trash can or send it back to the manufacturer. It should not be discarded at will.

Packing List:

Voice amplifier*1, 3.5mm audio cable*1, USB-C cable*1, headset wired microphone *1, adjustable waistband*1, user manual *1 (The wireless version will be equipped with 1 UHF transmitter S128 and 1 USB-C charging cable.)

Product specification:

1.Specification of wired and UHF wireless version with 4000mAh lithium battery:

Rated power:5W

Max power:10W

Loudspeaker:3 inches 2 ohmic magnetic speaker

Frequency response:120Hz-15KHz

Battery:3.7V/4000mAh, 2 lithium batteries in parallel   

Charging voltage:USB/DC 5V 1A

Charging time:4-6 hours

Using time:Wired: 35-38hours Wireless:20-25hours


Net weight:205.5g

2.Specification of wired and UHF wireless version with 2000mAh lithium battery:

Rated power:5W

Max power:10W

Loudspeaker:3 inches 2 ohmic magnetic speaker

Frequency response:120Hz-15KHz

Battery:3.7V/2000mAh,1 lithium battery

Charging voltage:USB/DC 5V 1A

Charging time:2-3 hours

Using time:Wired: 16-18hours Wireless: 8-10hours


Net weight: 159.5g

3.Specifications of S128 UHF wireless transmitter Product Support

Battery:  3.7V/600mAh

Charging voltage:  USB/DC 5V 0.5A

Charging time:  2 hours

Using time:Wired:  5-7hours

Frequency:  657MHz-663MHz

Wireless distance:  20 meters


Shanghai Norwii Technology Co., Ltd

Address: No.277 Jinfeng Road, Pudong New Area, Shanghai, 201201, China

Tel: 86-21-51872080

Email: support@norwii.com