Features: 1) Bluetooth Version: Version 1.1 /1.2 2) Operating distance: 10m 3) Weight: a) 11.5g without battery b) 22.5g with battery 4) Range of frequency: 2.4GHz spectrum 5) Dimensions (L x W x H): 72 x 24.5 x 16mm 6) Talk time: up to 15 hours talk-time 7) Standby time: up to 700 hours 8) Ear compatibility: adjustable for both left and right ears 9) Compatible with a) Alkalescent battery: AAA (1.5V / 900mAh) b) Rechargeable battery: Ni-MH (1.2V / 900mAh) 10) USB charger Packing: Gift box