Jabra/GN Netcom BT2050. Wireless range: 10 m, Bluetooth version: 2.0+EDR. Headphone frequency: 300 - 3000 Hz, Headphone sensitivity: -2 dB, Impedance: 32 Ом. Microphone sensitivity: 14 dB. Talk time: 4 h, Standby time: 180 h. Dimensions (WxDxH): 18.9 x 41.5 x 25.9 mm, Weight: 8 g