Type: Programming with the receiver Installation: wireless Corresponding frequency: 433.92 MHz Code: Rolling code Only Compatible With:for S449 QZ2;for S449 QZ4 Battery: Include Battery,Remote come with Battery!!! Security of use: dynamic code provides a high level of security, non-copyable code. Disclaimer:Your Old remote must be same as the advertisement, new remote do not compatible with other remotes. 1. Locate the Learn / Code Set button on the motor. This is usually under the lamp cover, or on the back of the motor. 2. the Learn / Code Set button once, then let go. A light should illuminate. 3. the desired transmitter button once, and the light go out. 4. the remote again the the light flash on the motor and then go out, signifying the remote has been coded. 5. Test the operation of the remote. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Specification:2 keys Color: As Shown Material: plastic Package Contents: 1 x garage door Transmitter 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.