Amazon.com: BAOFENG Walkie Talkie Earpiece with Mic 2 Pin K Port 2PCS Walkie Talkie Handsfree Bluetooth PTT Earpiece Wireless Headphone JUEJET Walkie Talkies Earpiece Radio Headset 2 Pin Covert Acoustic Tube Baofeng 2 Pin High Quality Headset Microphone For Two Way Radio. 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