Product specification: - Bluetooth compatible specifications: V4.1 - Operating frequency band: 2.4GHz-2.48GHz unlicensed ISM band - Output Power: Class 2 power Output, up to 10 meters - Support Profiles: HSP, HFP1.5, A2DP Profiles - Support Multiple Paired Devices: Up to 8 devices - Integrated with the SDP echo cancellation - Battery status display on the phone (only support IOS device) - Battery: 61mAh (Rechargeable Lithium Polymer), 3.7V DC - Talk time: around 8 hours - Music play time: around 7 hours - Standby time: up to 130 hours - Charge time: less 2 hours - Power Input Voltage: 5V - Operating temperature range: -20¡æ~ + 70¡æ - Weight: 18g - Size: 62*39*13mm Package includes: 1 * Wireless Handsfree Headset 1 * Charging Cable 1 * user manual