1. Introduction
Thank you for choosing the Giecy Portable Voice Amplifier S300. This device is designed to amplify your voice clearly and powerfully, making it ideal for teachers, tour guides, coaches, lecturers, and anyone needing to project their voice in various settings. Its compact and lightweight design ensures portability and ease of use.

Image: The Giecy Portable Voice Amplifier is suitable for diverse applications including teaching, retail, fitness, guided tours, public transport, and outdoor speaking.
2. What's in the Box
- Voice amplifier
- Wired Microphone Headset
- Charging Cable
- Waistband/Strap
- User Manual
3. Product Features
- Portable & Lightweight Design: Weighs only 150g with dimensions of 8.6cm x 10.5cm for easy carrying.
- Long-Lasting Rechargeable Battery: Equipped with a 2600mAh lithium battery, providing 8-10 hours in microphone mode and 6-8 hours in music mode after a 3-hour charge.
- Powerful 15W Clear Sound Output: Delivers crisp, distortion-free audio.
- Flexible Playback Options: Supports TF card and USB flash drive for music or recorded content playback.
- Multi-Functional & User-Friendly Operation: Intuitive buttons for mode switching, volume adjustment, play/pause, and track navigation.
- Built-in Microphone Jack: For seamless use with the included headset mic.
- Bluetooth Connectivity: Connects wirelessly to devices like smartphones and tablets.
- FM Radio: Integrated FM radio function.
- Recording Function: Ability to record audio to a USB drive or TF card.

Image: Overview of the amplifier's key features including Bluetooth, recording, TF card, USB, FM radio, high-energy speaker, whistle-stop, and microphone headset support.

Image: Visual representation of the amplifier's core capabilities: long-lasting battery, USB compatibility, headset microphone, powerful speaker, TF card slot, and portability.

Image: The amplifier's lightweight design, weighing only 150g, is demonstrated by comparing its weight to three eggs.
4. Setup
- Charge the Amplifier: Before first use, fully charge the amplifier using the provided charging cable. Refer to the 'Charging' section for details.
- Connect the Microphone Headset: Insert the 3.5mm jack of the wired microphone headset into the 'Mic' port on the side of the amplifier.
- Wear the Headset: Position the microphone close to your mouth (approximately 1-2 cm) for optimal voice pickup.
- Secure the Amplifier: Use the waistband/strap to wear the amplifier around your waist or shoulder for hands-free operation.
5. Operating Instructions
5.1 Controls Overview

Image: Detailed view of the amplifier's control panel and side ports, indicating functions for mode selection, track control, volume/power, microphone input, TF card slot, USB port, and charging port.
- VOL +/- (On/Off): Rotary knob for power on/off and volume adjustment. Turn clockwise to power on and increase volume; turn counter-clockwise to decrease volume and power off.
- M (Mode Selection): Press to cycle through different modes (Microphone, Bluetooth, FM Radio, TF Card, USB).
- Previous/Next: Used to navigate tracks in music playback modes or stations in FM mode.
- Play/Pause: Used to play or pause audio playback.
5.2 Microphone Usage
After connecting the wired microphone headset to the 'Mic' port, turn on the amplifier using the VOL knob. Adjust the volume to a comfortable level. Ensure the microphone is positioned correctly near your mouth for clear voice amplification.
5.3 Mode Selection
Press the 'M' button to switch between the following modes:
- Microphone Mode: Default mode for voice amplification.
- Bluetooth Mode: For wireless audio streaming from compatible devices.
- FM Radio Mode: For listening to FM radio stations.
- TF Card Mode: For playing audio files from a TF (MicroSD) card.
- USB Mode: For playing audio files from a USB flash drive.
5.4 Bluetooth Connection
- Switch the amplifier to Bluetooth mode using the 'M' button. The amplifier will indicate it's in Bluetooth pairing mode.
- On your device (smartphone, tablet, computer), enable Bluetooth and search for available devices.
- Select "G300" from the list of devices to pair.
- Once paired, you can play audio from your device through the amplifier.

Image: The amplifier's Bluetooth connectivity allows wireless audio streaming from devices such as laptops and smartphones.
5.5 TF Card / USB Playback
- Insert a TF card into the 'TF' slot or a USB flash drive into the 'USB' port.
- Switch the amplifier to TF Card mode or USB mode using the 'M' button.
- The amplifier will automatically start playing audio files. Use the 'Previous', 'Next', and 'Play/Pause' buttons to control playback.
5.6 FM Radio
- Switch the amplifier to FM Radio mode using the 'M' button.
- Press and hold the 'Play/Pause' button to auto-scan and save available FM stations.
- Use the 'Previous' and 'Next' buttons to switch between saved stations.

Image: The amplifier's FM radio mode allows users to enjoy music or broadcasts, even in outdoor settings.
5.7 Recording Function
When a USB flash drive or TF card is inserted, the amplifier supports recording. In microphone mode, press and hold the 'Play/Pause' button to start recording. Press it again to stop and save the recording. The recorded files will be saved in MP3 format on the storage device.
6. Charging
Connect the provided charging cable to the '5V' charging port on the amplifier and to a standard USB power adapter (not included). The charging indicator light will illuminate. A full charge takes approximately 3 hours. The 2600mAh battery provides 8-10 hours of use in microphone mode and 6-8 hours in music mode.

Image: Battery performance details: 8-10 hours in microphone mode, 6-8 hours in music mode, with a 3-hour charging time for the 2600mAh battery.

Image: The amplifier features a 2800mAh battery, offering extended usage of 14-17 hours in microphone mode and 7-10 hours in music mode on a single charge.
7. Important Usage Tips
To prevent feedback (a high-pitched squealing sound) and ensure optimal performance:
- Do not place the microphone directly in front of or too close to the voice amplifier.
- Maintain a distance of 30-50 cm (11.8-19.6 inches) between the microphone and the amplifier.

Image: Visual guide on how to properly position the microphone relative to the amplifier to prevent unwanted feedback.
8. Maintenance
- Clean the amplifier and microphone with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Avoid dropping or subjecting the device to strong impacts.
- Keep the charging port and other interfaces free from dust and debris.
9. Troubleshooting
- No Sound:
- Ensure the amplifier is powered on and the volume is turned up.
- Check if the microphone is securely plugged into the 'Mic' port.
- Verify that the correct mode is selected (e.g., Microphone mode for voice amplification).
- Feedback (Squealing Sound):
- Increase the distance between the microphone and the amplifier.
- Lower the volume.
- Ensure the microphone is not pointing directly at the speaker.
- Device Not Charging:
- Check if the charging cable is properly connected to both the amplifier and the power source.
- Ensure the power adapter is functional.
- Bluetooth Pairing Issues:
- Ensure the amplifier is in Bluetooth pairing mode.
- Disable and re-enable Bluetooth on your device.
- Move your device closer to the amplifier.
10. Specifications
| Brand | Giecy |
| Model Number | S300 |
| Output Wattage | 15 Watts |
| Battery Capacity | 2600mAh (Lithium) |
| Charging Time | Approx. 3 hours |
| Usage Time (Mic Mode) | 8-10 hours |
| Usage Time (Music Mode) | 6-8 hours |
| Material | Plastic |
| Dimensions | 8.6cm x 10.5cm (approx.) |
| Weight | 150g (approx.) |
11. Warranty
This Giecy product comes with a ONE YEAR warranty from the date of purchase. This warranty covers manufacturing defects and workmanship. It does not cover damage caused by misuse, accidents, unauthorized modifications, or normal wear and tear. Please retain your proof of purchase for warranty claims.
12. Support
For further assistance, technical support, or warranty inquiries, please refer to the contact information provided with your purchase or visit the official Giecy website. Please have your model number (S300) and proof of purchase ready when contacting support.