This is RF wireless repeater which amplifies the wireless signal when the distance between transmitter and receiver is too long. Just install the repeater between transmitter and receiver, while it receives wireless signal, it enhances and send out again to the receiver. Features: 1.Working frequency: 433MHz 2.Sensitivity: -108dBm 3.Standby current: 30mA 4.Working current: ＜255mA 5.Adapter: AC 100-240V 50/60Hz 6.Working voltage: DC 12V 1A 7.Transmitting power: 500mW 8.Transmitting distance is about 1000m in the open area 9.Size: 100 x 70 x 25mm 10.Weight: 102g Package Includes: 1 x RF Wireless Repeater 1 x Power adaptor 1 x English manual.