Spec: 1.
Loudhailer diameter: 40mm
2.
Frequency range:: 20-20, 000Hz
3.
Impedance: 32 Ohm at 1khz
4.
Max Input power: 20mW (maximum)
5.
Wireless Frequency: 2402MHZ-2480MHZ
6.
Bluetooth standard: 4.0 +EDR
7.
Working Current: 30MA-50MA
8.
Working Voltage: 3.7V
9.
Calling time: 6H
10.
Music Playing time: 7H
11.
Bluetooth standby time: 180H
12.
Usage Distance: About 10m