Bluetooth version: Version 1.2 Range of Frequency: 2.4 GHz Spectrum Operating Rang: Up to 10 Meters (33 Feet) Typical Talk Time: 5 hours Typical Standby Time: 100 hours Dimension 56mm(L) X17mm(W) X 14 mm(H) Weight: 8.5 grams Ear compatibility - Adjustable for both left and right ear. Battery - Rechargeable Li-ploymer low battery indicator.