Zeadio Acoustic Tube Earpiece Headset PTT for 2 PIN Motorola Radio Rdv-5100 Rdv2020 Rdu2020 Rdu2080dd Rdu4100 Rdu4160d Rdv2080d Rdv5100 Blackbox-v Blackbox-u Etc. Excellent for use in police, military, nightclubs, bars, paintball, security,restaurants, hotels, bouncer, warehouses, and noisy environments. High quality heavy duty microphone. Transducer with Clip. Can be attached covertly to an undergarment or used overtly. Durable and thick cable, designed for tough environment Air Tube Covert Earpiece Headset with built-in line microphone This headset is for the Motorola radios and many more that require standard 2 Pin