1. This model does not have a button, can not insert a card, can not insert a U disk to play, no Bluetooth function, just a pure amplifier.
2. Loud volume, anti-whistle, long battery life
3. 5W loud volume, care for the voice, easy to control the whole field
4. Frequency shift noise reduction adaptive technology, high fidelity, low noise, even in the high-power output, will not produce significant distortion
5. With a headset, comfortable to wear, not easy to fall off
6. Built-in 1200 mAh lithium battery, up to 12 hours of battery life

Parameters:
1. Power: 8W (MAX)
2. Signal to noise ratio: 83dB
3. Charging voltage: DC5V
4. Input power: USB power supply
5. Distortion: 1% (3.7V, 1KHz, 1W)
6. Impedance: 2Ω
7. Speaker: 2.5 inches x 1
8. Operating temperature: -5-40 degrees Celsius
9. Product size: 85 x 38 x 39mm
10. Weight: 160g

Packing list:
Amplifier x 1
Head-worn wired microphone x 1
USB data cable x 1
Belt x 1
Instruction manual x 1