433.92MHz Grey Back Only: Make sure your original remote works at 433.92MHz and has a grey back. NOT compatible with Marantec Digital 868MHz with black back. NOT compatible with Marantec Bi-Linked series. Compatibility List: This is a replacement for Marantec 433.92MHz Multi-Bit remote controls. Compatible with Marantec Digital 302/ 304/ 306/ 313/ 317/ 318/ 321/ 323/ 382/ 384/ 392/ 394 433MHz. Compatible with Marantec Command 131 /132 / 222 / 231 433MHz List of compatible garage door opener receivers: Our remote control only works with garage door opener receivers that operate at a frequency of 433.92MHz 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 Tips: This garage door remote control is a replacement and not an original accessory. We recommend that you check the compatibility of the devices using the list below before purchasing Material: Plastic Color: As shown Package Contents: 2 x Remote controller 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.