specification：
1. Bluetooth: 4.2
2. Frequency response: 20 HZ-20 KHZ
3. Speaker: 7 W * 2 4Ω 50mm
4. SNR: ≥90db
5. Battery: 3.7 V / 4000 mAh
6. Load Voltage: 5V
7. Charge Time: 3-5 hours
8. Play time: 6-8 hours
9. Accessories: USB cable
function:
1. Support Bluetooth, USB, TF, AUX, and other playback functions,
2. Hands Free answer calls, voice instructions.
3. LED button lights
4. Built-in high-power dual-speaker, low-impact shock
5. High capacity 4000 mAh battery outdoor play support.