Modulation mode: GFSK/FSK Working frequency: 433/470MHz Output power: 17dBm(50mW) Receiving sensitivity: -118dBm@1,200bps Channels: 8/16/32 Transmitting current: 90í+5mA Receiving current: 28í+2mA Sleeping current: 5í+2uA Interface rate: 1,200/2,400/4,800/9,600/19,200bps Interface mode: UART TTL, RS-232 and RS-485 Power supply: DC +3.3 to 5V Working temperature: -25íµ to 75íµ Working humidity: 10% to 90% Dimension: 47 x 26 x 10mm Reliable transmit distance (AT-4 antenna): 1,200m@1,200bps with AT-4 antenna Communication mode: half-duplex Network topology: point to point and point to multi-point.