TB-21

Bluetooth version: V4.1
Support: A2DP, Headset, Hands-stereo
Battery capacity: 150mH with protection board
Talk time: 12 hours 
Standby time: 250 hours
Effective distance: 10 meters (one to two Bluetooth headset)
Charging time: 2 hours
Charging voltage: DC 5V
Packing size: 152 * 110 * 35 mm
Package weight: 65g
Main Functions:

* Support voice-activated calls.
* Support Blue tooth headset to play music.
* Support music cut songs.
* Support for last number redial.
* Caller Voice Reporting feature.
* Blue tooth headset operates voice prompts.
* Support one to two functions (one headset can be connected with two devices simultaneously)
* Support car navigation, voice and other software.
* Support Chinese and English switching.