Product Details:

-Version BT V4 1 EDR.
-Support HSP/HFP/A2DP/ACRCP.
-Charging Interface Point-Contact.
-Size : 28x20x28mm.
-Battery Reachargeable Lithium battery.
-Standby time : About 40 hours.
-Call Time : About 2 hours.
-Charging Time : About 2 hours.