Description: Features: brand new and high quality. Each module has a unique ID address code. All modules K1-K4 four for key code is the same. Pin Description: - : Negative power supply +: Positive power supply, for DC 3-24V K1: 1 short to Negative start transmitting data, Similar the A button on the remote control. K2: 2 short to Negative start transmitting data, Similar the B button on the remote control. K3: 3 short to Negative start transmitting data, Similar the C button on the remote control. K4: 4 short to Negative start transmitting data, Similar the D button on the remote control. Application environment: Remote control switch,motorcycles, automobile anti-theft products, home security products, electric doors, shutter doors, for windows, remote control socket, remote control LED, remote audio remote control electric doors, garage door remote control, remote control retractable doors, remote volume gate, pan doors, remote control door opener, door closing device control system, remote control curtains, alarm host, alarm, remote control motorcycle remote control electric for cars, remote control MP3, etc. Specifications: Item Type: Wireless RF Remote Control Transmitter Module (1527 Encoding ) Model: TX118SA-4 Transmitting power: 11dbm Distance: 30-100m Emission current: 10MA Rate of fire: maximum 10KB / S Transmit deviation: +/- 7. 5KHZ / narrow-band emission Modulation: ASK Operating Voltage: for DC 3V-24V Encoding: EV1527 1527 Learning code Material: Plastic+Metal Color: shown as pictures Size: 1.81.8cm/0.710.71in (Approx.) Quantity: 1 PC (other accessories demo in the picture is not included) Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 X Wireless RF Remote Control Transmitter Module (No retail package)