* BT ver: V4.1 support HSP,HFP,A2DP and AVRCP,SPP

* Chipset: Airoha AB 1511

* Body material: Plastic

* BT distance: 10m

* Passkey: 0000

* Voltage: DC 5V

* Power grade: Class 2

* Speaker impedance: 16Ω

* Speaker frequency response: 20~20KHz

* Microphone sensitivity: 42+-3Db

* Microphone impedance: 200Ω

* Working Frequency: 2.402-2.48GHz

* Voltage alarm/shutdown voltage: 3.3V/3.0v

* Charging time: about 1 hour

* Music playing: about 3 hours

* Talking time: about 4 hours

* Standby time: 100 hours

* Battery size: 15*12*4mm  40mAh

* Support agreement: Handfree BT audio transfer

* Applicable models: various of brand bluetooth cell phone

Packing list:

* Left channel headphone*1

* Right channel headphone*1

* Charging storage box*1