["Description:\r\n\r\nFeatures:\r\nbrand new and high quality.\r\nEach module has a unique ID address code. \r\nAll modules K1-K4 four for key code is the same. \r\nPin Description: \r\n- : Negative power supply \r\n+: Positive power supply, for DC 3-24V\r\n \r\nK1: 1 short to Negative start transmitting data, Similar the A button on the remote control.\r\nK2: 2 short to Negative start transmitting data, Similar the B button on the remote control.\r\nK3: 3 short to Negative start transmitting data, Similar the C button on the remote control.\r\nK4: 4 short to Negative start transmitting data, Similar the D button on the remote control.\r\n\r\nApplication environment:\r\nRemote 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.\r\n\r\nSpecifications:\r\nItem Type: Wireless RF Remote Control Transmitter Module (1527 Encoding )\r\nModel: TX118SA-4\r\nTransmitting power: 11dbm\r\nDistance: 30-100m\r\nEmission current: 10MA\r\nRate of fire: maximum 10KB / S\r\nTransmit deviation: +/- 7. 5KHZ / narrow-band emission\r\nModulation: ASK\r\nOperating Voltage: for DC 3V-24V\r\nEncoding: EV1527 1527 Learning code\r\nMaterial: Plastic+Metal\r\nColor: shown as pictures\r\nSize: 1.8×1.8cm/0.71×0.71in (Approx.)\r\nQuantity: 1 PC (other accessories demo in the picture is not included)\r\n\r\nNote: \r\n1.Transition: 1cm=10mm=0.39inch\r\n2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\r\n3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\r\n\r\nPackage includes:\r\n1 X Wireless RF Remote Control Transmitter Module (No retail package)"]