1: Supply voltage 3.2V ~ 5.5V. (If you to work in the module launch state for a long time, it is recommended when the supply voltage exceeds 4.5V series with a 1N4007 diode, to avoid heating module built LDO) 2: Default communication distance (open test): about 600m (adjustable to achieve the maximum communication distance of 1000m, the air rate 5000bps). 3: The default idle current: 16MA (modules in different operating current of the different operating modes). 4: Module Size: 27.8mm x 14.4mm x 4mm. 5: Operating frequency range (433.4-473.0MHz, up to 100 communication channels) Maximum 100mW transmit power (can be set) 6: The module supports software upgrades 7: The default : operating mode FU3, rate 9600bps, communication channel CH001 (433.4M). Colour:black Material:PCB + electronic accessories Package Contents: 1 x wireless module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.