Universal Wireless Bluetooth Headset Earpieces Bluetooth Ver 2.1 + EDR, Wireless working range: up to 10 meters Talking time: up to 3 hours, Stanby time: up to 100 hours Battery: rechargeable Li-Polymer, Charging time: 2 to 3 hours OperaDimensions: 35mm x 20mm x 13mmting Temp.: 5F ~ 131F Dimensions: 35mm x 20mm x 13mm, Weight: 8g