Only 433.92MHz Grey Back: Make sure your original remote control operates at 433.92MHz and has a grey back. NOT compatible with Marantec Digital 868 MHz with black back. NOT compatible with Marantec Bi-Linked series. Compatibility List: This is a replacement for Marantec 433.92 MHz Multi-Bit remotes. Compatible with Marantec Digital 302/304/306/313/317/318/321/323/382/384/392/394 433 MHz. Compatible with Marantec Command 131/132/222/231 433 MHz List of compatible garage door openers: Our remote control only works with garage door openers operating at a frequency of 433.92 MHz multi-bit. Compatible with Marantec Comfort 50/51/60/211/220/220.2/250/250.2/252/252.2/500/510/520/580/800/820/830/850/851/870 Warm tip: This garage door remote control is a replacement and not an original accessory. We recommend checking the compatibility between your devices using the list below before purchasing. Material: Plastic Color: As shown. Package contents: 2 x 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 allowed measurement error is +/- 1-3 cm.