Introduction
The SHIDU S258 Voice Amplifier is a compact and portable public address system designed to amplify your voice clearly and effectively. It is ideal for various applications such as teaching, tour guiding, coaching, and public speaking, helping to save your voice and ensure your message is heard by a large audience. This manual provides comprehensive instructions for the setup, operation, maintenance, and troubleshooting of your SHIDU S258 Voice Amplifier.

Image: The SHIDU S258 Voice Amplifier in Rose-Gold, shown with its accompanying headset microphone and charging cable.
Product Features
- Powerful & Original Sound: Compact size with crystal clear output, capable of covering a room with up to 120 people without noise or whistling.
- Wide Coverage Area: 10W output power can cover approximately 11,800 sq. ft (1100 ㎡), ensuring effective voice amplification.
- Long Battery Life: Equipped with an 1800mAh built-in rechargeable lithium battery, providing up to 12 hours of amplification time or 10 hours of music playback on a full charge (3-5 hours charging time).
- Multifunctional Playback: Supports TF (Micro SD) card playback and USB flash drive playback. Features include repeating individual songs, looping all music, and switching songs.
- AUX Input Capability: The microphone port doubles as an AUX port, allowing connection to cell phones or computers via a 3.5mm AUX cable for use as a wired speaker.
- Compact and Portable: Weighs only 0.36 lbs (approximately 163 grams), featuring a detachable clip for attachment to a belt or pocket, or use with the included waistband.
- Durable Design: Constructed from wear-resistant material for enhanced durability and a fashionable appearance.

Image: An overview of the SHIDU S258 Voice Amplifier's dimensions and core functionalities, including sound quality, power output, battery life, and media playback options.

Image: Visual representation highlighting the long-lasting 1800mAh rechargeable battery, providing up to 12 hours of amplification.
Package Contents
Upon opening the package, verify that all the following items are included:
- 1 x SHIDU Voice Amplifier (S258)
- 1 x Wired Headset Microphone
- 1 x USB Charging Cable
- 1 x Waistband

Image: The complete set of items included in the SHIDU Voice Amplifier package.
Setup
- Charging the Amplifier:
Before first use, fully charge the voice amplifier. Connect the provided USB charging cable to the DC 5V port on the amplifier and plug the other end into a USB power adapter (not included) or a computer's USB port. The charging indicator light will show charging status and turn off when fully charged. A full charge typically takes 3-5 hours.
- Connecting the Headset Microphone:
Insert the 3.5mm jack of the wired headset microphone firmly into the microphone input port on the amplifier. Ensure a secure connection.
- Wearing the Amplifier and Microphone:
You can wear the amplifier in several ways:
- Use the detachable clip to attach it to your belt or pocket.
- Attach the waistband to the amplifier's loops and wear it around your waist or hang it around your neck.
Position the headset microphone close to your mouth, ideally about 1-2 cm away, for optimal voice pickup. Ensure the microphone is pointed towards your mouth.

Image: Demonstrations of the SHIDU Voice Amplifier being used in different professional settings, highlighting its versatility.
Operating Instructions
- Power On/Off:
Locate the power switch on the amplifier. Slide it to the "ON" position to power on the device. Slide it to the "OFF" position to power off.
- Volume Control:
Adjust the volume using the volume roller or buttons on the amplifier. Rotate or press to increase or decrease the amplification level to a comfortable listening volume.
- Voice Amplification:
Once powered on and the microphone is connected, speak into the headset microphone. Your voice will be amplified through the speaker.
Important: To prevent feedback (a high-pitched squeal), ensure there is sufficient distance between the microphone and the speaker, and avoid pointing the microphone directly at the speaker.
- Playing Audio from TF Card/USB Drive:
Insert a TF (Micro SD) card or USB flash drive containing MP3 audio files into the respective slot on the amplifier. The amplifier will automatically detect and begin playing the audio files. Use the control buttons to skip tracks, repeat, or loop playback.
- Using as a Wired Speaker (AUX Mode):
Connect your mobile phone, computer, or other audio device to the amplifier's microphone port using a 3.5mm AUX cable. The amplifier will function as an external wired speaker for your device.

Image: The SHIDU Voice Amplifier effectively projecting sound in a classroom environment, showcasing its 10W output capability.

Image: A visual guide to the amplifier's connectivity options and control functions, such as AUX, USB, and TF card playback.
Maintenance
- Cleaning: Wipe the amplifier and microphone with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: To prolong battery life, avoid fully discharging the battery frequently. Recharge the amplifier when the battery is low. If storing for an extended period, charge the battery to about 50% every 3 months.
- Handling: Handle the amplifier and microphone with care to prevent damage from drops or impacts.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound or low volume |
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| High-pitched feedback (whistling) |
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| Cannot play audio from TF card/USB drive |
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| Device not charging |
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Specifications
| Feature | Detail |
|---|---|
| Brand | SHIDU |
| Model Number | S258 |
| Output Wattage | 10 Watts |
| Battery Type | Lithium Ion |
| Battery Capacity | 1800mAh |
| Amplification Time | Up to 12 hours |
| Music Playback Time | Up to 10 hours |
| Charging Time | 3-5 hours |
| Item Weight | 11.6 ounces (330 Grams) |
| Product Dimensions (L x W x H) | 4.13 x 1.57 x 3.35 inches |
| Connectivity Technology | AUX, USB |
| Audio Input | AUX |
| Supported Media | TF (Micro SD) card, USB flash drive (MP3 format) |
| Color | Rose-Gold |
| UPC | 759675088348 |

Image: The SHIDU Voice Amplifier's coverage capability, demonstrating its effectiveness in large spaces.
Warranty and Support
SHIDU offers a comprehensive warranty and support for the S258 Voice Amplifier:
- Return and Refund Policy: We provide return and refund without reason within 30 days of purchase.
- Warranty Period: A 36-month (3-year) warranty is provided from the date of purchase.
- Technical Support: Lifetime technical support is available for your product.
For warranty claims, technical assistance, or any inquiries, please contact SHIDU customer support through the retailer where the product was purchased or visit the official SHIDU website for contact information.