At-828 two way radio: Specification: frequency range: vhf:136-174mhz uhf:400-470mhz channel: 100 channels channel space: broadband25khz, narrowband12.5khz channel step: 5, 6.25, 10, 12.5, 25khz working power: 7.2v dc ía 20% temperature range: - 20ípc ~ + 60ípc frequency stability: ía 50ppm product size: 90*55*32mm(antenna exclusive) communication distance:5km(no shadow) battery: 1200mah lithium batteries Transmitter: output power: 5w(high)/2w(middle)/1w(low) modulation: broadband16kª¦f3e, narrowband 11kª¦f3e max frequency deviation:broadband