Modulation mode: GFSK/FSK Frequency: 403/433/470/868/915MHz Output power: 27dBm (500mW) Channels: 8/16/32 Receiving sensitivity: -119dBm (403/433/470MHz @2400bps) -116dBm (868MHz @2400bps) -115dBm (915MHz @2400bps) Transmitting current: 450 to 550mA Receiving current: 32 to 38mA Sleeping current: 5 to 30uA Baud rate: 1,200/2,400/4,800/9,600bps Interface mode: TTL/RS232/RS485 Dimension: 53 x 38x10mm Reliable transmission distance: 2.5KM with AT-14 antenna@4800bps Communication mode: half-duplex.