The Realistic Voice Actuated FM Transceiver 21-400 is a reliable two-way radio communication device with a VHF band and analog communications protocol. This black transceiver, part of the Radio Shack product line, has been tested and confirmed to work effectively. With its realistic voice-activated feature and simple design, this transceiver is a valuable option for those in need of a calling system for various communication needs. Its compact size and lightweight design make it convenient to carry and use in different situations.