... > 500 meters 3 Small and very portable 4 Full-duplex two way communications: TA-502 is a multifunctional 2.4G wireless digital ... -distance wireless data Voice transceiver modules. It has the latest high-performance RF radio chip and industrial-grade processing chip, Equipped ... 110V ~ 240V, 50/60Hz , Output 5V/1A , pass safety Certification. two way communications for Police