Bluetooth version: V1.2 Operating Distance: 10 Meters Weight: with only 9 grams Range of Frequency: 2.4GHz-2.4835Ghz ISM Band Dimension: 59mm(L) X 26mm(W) X 10.5mm(H) Talk time: Up to 5 hours talk-time Standby time: Up to 100 hours Normal charging time: Within 3 hours Ear compatibility - Ajustable for both left and right ear. Rechargeable Li-ion ploymer battery