Amazon.com: BAOFENG 2 Pin PTT Covert Acoustic Tube Earpiece Headset 2 Pin Walkie Talkie Headset Wired Two Way Ham Radio Earpiece Earphone Baofeng walkie talkie headset ptt wireless bluetooth earphone for two Sb54756a9bd25465a9a382ade7b41f8aej.jpg Baofeng Walkie Talkie Headset PTT Wireless Bluetooth Earphone for 2 Pin Walkie Talkie Headsets 2 PIN Earpiece Headset PTT MIC for BAOFENG 480. Specifications: Frequency Range UHF 400 470MHz RF Rated Power 5W Channel Capacity 16 Channel Spacing 25KHz Operated Voltage 3. 7 V Battery 1500MAh Li ion Battery Life About 8 hours Frequency Stability 2. 5ppm Operated Temperature 30c +60c Antenna Impedance 50 Dimensions (LWH) (with battery,without antenna) 1105032 mm Weight (with battery antenna) 198g Communication Range about 2 4km Transmitter RF Power Output 3W Modulation F3E Spurious Emission 65dB FM Noise 45dB(W) 40dB (N) Audio Distortion 5% Transmitting Current 1. 3A Receiver Sensitivity (12dB SINAD) 0. 20 uV Selectivity 55dB 50dB Intermodulation 65dB Adjacent Channel Selectivity 60dB Spurious Response 60dB Audio Power Output 1000mWPackage Includes: 2 x Baofeng BF 888S Radios2 x 3. 7V 1500mAh Batteries2 x SMA Female Antennas2 x Belt Clips2 x Manuals2 x Desktop Charger2 x Wrist Straps2 x Earpieces