Description: Function: This kind of door controller has a copy and remove function, you can set the programs easily. Applications: This remote controller is suitable for garage doors, rolling doors, LED lamps, motorcycle alarms and other devices. Wireless: This door opener works with a transferring frequency of for 433MHz, you can connect it to devices supporting this frequency. Electronic: This control key is powered by a build-in 2032 button battery, cordless and compact. Portable: This electric key can be carried easily because it is small and lightweight, suitable for home and outdoor use. Specification: Material: plastic. Color: green, yellow, blue, red. Size: approx. 5.6*3.2*1.1CM/2.2x1.26x0.43inch. Work voltage: DC3V. Work current: 12mA. Power: 12mW. Transferring frequency: for 433MHz, Transferring distance: approx. 50-100M/164.04-328.08ft(field, the receiver sensitivity is -100dBm). Encoder type: fixed code, learning code, partial scrolling code. How to use: 1. Clear: press the above two buttons at the same time, release the right hand (do not release the left hand) after the LED indicator blinks for 3 times. Press the right button 3 times with your right hand, and the indicator blinks. Press any key again and the light is still off. The clearing function is finished. 2. Copy: Press the button corresponding to the old remote control and the current remote control at the same time (you can decide which one). During the period, the light flashes fast twice, and after blinking slowly for 3 times, the two buttons are copied. The following three keys are copied. Note: Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow a slight deviation for the measurement data and make sure you do not mind before ordering. Package Includes: 4 Pieces for 433MHz Remote Controllers.