Bluetooth technical parameters and product features
1 drive: 40 mm
2 impedance: 32 OHM
3 Bluetooth version: Bluetooth v4.0+EDR
4 power level: CLASS II
5 output power: 30mW
6 Bluetooth distance: barrier free 10 meters
7 frequency response: 20-20000Hz
8 working voltage range: 3.0V-4.2V
9 microphone head sensitivity: -42dB
10 with A2DP /AVRCP high quality stereo audio transmission and remote control protocol
11 powerful noise cancellation circuit (active noise reduction)
12 wired and Bluetooth automatic switching， support audio input
13 charging time of about 1 hours (power indicator charge: blue light light， full of electricity: blue lights out.)
14 product size: diameter 18MM. Long 25MM
15 product net weight of about 4G
16 talk time about 4 hours
17 music time about 3 hours
18 standby time of about 3-5 days
19 charging power supply: DC5V power supply (computer USB port， mobile phone charger， car charge)
20 compatible with Bluetooth compatible mobile phone: Android， apple， Microsoft feature phone