Specifications: Brand: Fineblue Model: FM500 Bluetooth version: Bluetooth version V4.1 Supported protocols: A2DP Transmission distance of 10 meters Transmission frequency: 2.4GHz of Frequency response: 20HZ-20KHZ Impedance: 32 ohm impedance Charging voltage: DC 5V Charging time: less than 2 hours Talk time: more than 10 hours Music Time: 7 hours Standby time: 100 hours Battery: 130MA Cable length: Approx. 83 cm /32.68in Package Size: approx. 20 * 16.5 * 3.5 cm /7.87*6.50*1.38in Package weight: approx. 148 g /5.24 oz. Package: 1 * Bluetooth headset 1 * USB cable 1 * User Manual