Package Content: you will receive 3 door opening remotes with built in 23A 12V dry batteries, including keychain, which can meet your use needs, and you can operate them well. Compatible Model: this garage door remote control is not universal, and is only compatible with the multi code 3089 300MHz garage door remote control receiver with 10 dial switches; It is incompatible with the "8" or "9" dial switch; Please pay attention to the information before purchasing. Programming Notes: the for multicode 3089 300MHz garage door remote operates at 300mhz and has 10 dip switches, the instructions are clear and easy to program; Before starting remote programming, make sure your garage door opener is fully closed. Safe and Reliable: the latest RF technology and strong security encryption design ensure garage opener better operating range, 300MHz frequency and rolling code technology to protect your access and connection, which can significantly reduce radio wave interference; The highest level of encryption avoids invasion, and long distance stable work effect provides you with the security of your garage property, so you can rest assured to buy. Portable and Wide Range: small and light keychain remote switch is portable, can be put into the handbag, purse, pocket, etc., does not take up much space; Keychain remote control with strong signal transmission covers a wide range, convenient and flexible, bringing large convenience for you. Colour:Black Material:plastic Package Contents: 3 * Garage Door Remote Control 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.