Built-in EV1527 decoder, transmits immediately upon power-on. Long-distance transmission, low power consumption. Wide voltage range, compatible with DC 3V-12V/DC 3V-24V. Compact size. Performance Parameters: Frequency: 433-433.92MHz Transmit Power: greater than equal 10 dBm Transmission Distance: 100-300 meters (open, unobstructed area) Transmit Power Consumption: 5-6mA, no power consumption when not transmitting a signal. Technical Notes: Input Voltage Selectable: DC3V-12V / DC 3V-24V. The transmitter module transmits signals immediately upon power-on. It can be used with a learning receiver and can be used in other sensors, or other microcontrollers. Operating Voltage: DC3V-DC12V (Transmission distance depends on voltage and current. If powered by a regulated power supply (3.6V or higher), the effective range can reach several meters. If using dry cell batteries, please use 12V 23A/12V 27A/9V batteries. Do not use two 1.5V batteries or one 3V button cell battery simultaneously. We recommend a minimum dry cell battery voltage of 4.5V and a minimum button cell battery voltage of 6V. Insufficient voltage and current will affect the effective range.) Color: As Shown Material: Metal Package Contents: 1*receiver module 1*transmitter 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.