Specs:

fully touch system call pic up ,call drop , resume , pause ,volume up ,volume down
•Design version: Wireless V5.3+EDR
Sensitivity: -90dBm
* Signal distance: ≥10 meters huge distance coverer one of best feature
Nominal Voltage: 3.7V
* Frequency: 2.4G
Play time: about 4 hours
•Talk time: about 4 hours
Standby time: about 80 hours ( powerful battery )
* Charging time: charge the charging box for about 1 hours, give Charge the headset for about 1 hour Number of times the charging box charges the headset: 6 times for a single headset

you can use them with two mobiles at the same time ( main feature )