Improved compatibility: This replacement transmitter is compatible with a wide range of Marantec models, including D302-868, D304-868, D222-868, D313-868, D321-868, D323-868, D382-868, D384-868, D392-868. Ensure seamless operation with these specific models. Frequency specific: This remote control operates on a frequency of 868.3 MHz with a black back, ensuring it is compatible with your Marantec Digital 868.3 MHz remote control. Note: It is not compatible with 433 MHz frequency models that have a light gray back. Dual door control: Each of the two buttons on the remote control corresponds to an independent channel, allowing you to control up to two garage doors separately. This feature provides a convenient solution for garage installations with multiple doors. Color: Photo color Material: plastic Package contents: 2 x Garage door remote control Only the above package contents, other products are not included. Note: Light reflections and different monitors may cause the color of the item in the picture to differ slightly from the real item. The allowed measurement is +/- 1-3 cm.