Wireless Intercom 2-Way, Band Type VHF, Material Polycarbonate, Channels 1, Output Watts 800 mW, Width (In.) 5 in, Height (In.) 7 in, Length (In.) 3 in, 27 Programmable Channels, 154, No External Channel Select, Battery (3) D Alkaline Batteries, Provides Up to 5000 Transmissions, Operating Range Up to 2 Miles, Includes Concealed Vandal-Proof Antenna, Mounting Brackets, For Use With 1AAK1, 1PA68, 41P008, 41P012, 4RB57, 4RB58, 4RB59, 4RB60, 4YN05, Black