LongTong M1 Black-red wireless bluetooth speaker

Bluetooth V4.0
Support agreement: MP3 A2DP ARVCP HFP
Support :mobile phone, laptop, blue tooth devices
Speaker: 40mm
Impedance: 32Ω
Sensitivity: 90dB
Battery: Lithium 
Battery capacity: 450mAh
Battery life-span: 500 times of charging (above 80%)
Charging Current: 500mA
Charging Voltage: 5V
Charging time: about 2hours