BluedioB multimedia Bluetooth headset is fundamental concept of Bluedio revolutionary music headset. Bluedio B is also a multifunction Bluetooth headset. Apart from Bluetooth stereo music ,Bluedio B also supports Micro-SD card music playing and comes with FM radio that you can listen to your favorite radio channel anytime with its channel memory function.Plus its personalize performance outlook, Bluedio B will satisfy all you need. Bluedio B Technical Specification: Drive Unit: 2pcs 40mm Neodymium Drivers Bluetooth Version: V3.0 Operating Distance: Up To 20m (free space) Bluetooth Music Playtime: around 23hrs Talk Time: around 23hrs Micro-SD Card Music Playtime: around 13hrs FM Playtime: around 12hrs Standby Time: around 430hrs Charging Time: around 4hrs Battery: 650mAh Li-Polymer Rechargeable Battery Support Profile: A2DP, AVRCP, HSP, HFP Impedance: 150Ω Frequency Range: 20-20000Hz Operating Environment: -10 to 50℃ Sensitivity: 105dB Net Weight: 210g Body Size:7.48x7.48x2.28 inch Box Size:11.02x6.49x3.62 inch Package Including: Bluedio B Headset 1pc USB Charging Cable 1pc User Manual 1pc