The mobile communication device is designed to transmit information in the event of an emergency in cars, boats, lifeboats, islands and elsewhere. 6.5x5x35cm. Frequency range 138-174 Mhz. 7.5V battery 700 mA (rechargeable). Transmission power 0.25W / 2W. Shockproof, waterproof housing. Batteries not working. The set includes four radios and a charger. 1995-2000m. Item used.