Portable Speaker OEM High Quality Wireless Speakers Bluetooth 4'' HF-2156

Bluetooth version: Bluetooth 5.0
Amplifier specification: 5W
Frequency response range: 80Hz - 
10KHz
Signal-to-noise ratio: ≥75db
Power supply: Built-in 800mAh 
battery
Speaker: Dual 4-inch
Playing time: 2-3 hours
Charging time: 1 hour
Transmission distance: <10 
meters