HBQ I7S Double Dual Mini Wireless 4.1 Bluetooth Earphone With Power Case – White

Drive: 15mm
Impedance: 32 OHM
Bluetooth version: Bluetooth v4.1+EDR
Bluetooth frequency: 2.4GHz
Power level: CLASS II, output power: 30mW
Bluetooth Distance: obstacle free 10 meters
Frequency response: 20-20000Hz
Working voltage range: 3.0V-4.2V