Specifications Encoding method:Rolling code Hign-concerned Chemical:None Origin:Mainland China Certification:CE Battery:Include Battery Frequency:433.92MHz Chip Code:Rolling Code 433.92MHz Universal Garage Door Remote Control 3PCS AT-4N Remote Control With Gate Alutech Radio Control for External Receiver Specification Frequency : 433.92MHz Code:Rolling code Type of programming:programming with receiver Buttons:4 Battery:Include Battery Size:38mm70mm13mm Scope of application: garage door, alarm, automatic door, rolling door, etc Compatible Models Please kindly contact us to get the model compatible list, if you can't confirm whether your remote control can work with our remote. Thank you Access to receiver required. Please make sure that you can get access to your receiver/opener before purchase. Note: Your remote control must be same as below picture and your model must be in the list, and we will not be responsible for wrong purchasing. How to program new remote 1. Open the housing of your receiver. 2.,press the controller'slearning button to enter the learning situation 3.Press the remote control twice(the controller light goes out for the first time, and the controller light flashes for the second time) and the learning is successful. Include: 1x Remote Control 1x Battery 1x Keychain 1x English Manual