Package Content: you will receive 6 pieces of door openers compatible with Linear Delta 3 310MHZ built in 23A 12V dry battery, including instructions and key chain, which can meet your use needs, and you can operate them well Compatible Models: this garage door remote control is not universal, but only compatible with Linear Delta 3 (DTA DTD DTC DNT00002A) 310MHZ remote control with 8 position DIP switch; Please pay attention to the information before purchasing Programming Instructions: the garage door remote is compatible with Linear Delta 3/DTC Delta 3, which can control operates at 310MHz, with clear instructions and easy programming; The DIP switches are easily confused in direction, If your remote doesn't work on the first shot, try reversing all of the DIP switches; Before starting remote programming, make sure that the garage door opener is fully closed Safe and Reliable: the latest RF technology and powerful security encryption design ensure that the garage door opener has a better working range, 310MHz frequency and rolling code technology to protect your access and connection, thus significantly reducing radio interference; The highest level of encryption avoids intrusion, and the long term stable working effect provides you with the security of the garage property, so you can buy with confidence Portable and Wide Range: the small and lightweight key chain remote switch is portable and can be placed in handbags, wallets, pockets, etc., without occupying too much space; The key chain remote control with strong signal transmission has a wide coverage, convenient and flexible, which brings convenience to you Features: These garage door openers are light in weight, easy to carry and store, with enough quantity, you can share with your family members. You can send our garage opener remote as a considerate gift to your colleagues, neighbors, or other people, which will well enhance your close relationship, and they will appreciate receiving it. Specifications: Material: quality material Main color: black Size: as the picture shown Package includes: 6 x Garage door remotes (with batteries) Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays. The mention of any related model designation above is only for purposes of demonstrating compatibility, not work as brands, our brand is Kingdder.