Buying a Novoferm remote control requires your attention to several criteria. Indeed, two remote controls of the same brand may not be compatible. This is why you must choose the remote control according to its frequency, its number of buttons and channels, its color and its type of coding. The Novoferm NOVOTRON 502 MAX43-2 gate remote control operates on the 433.92 MHz frequency so it can replace Novoferm transmitters of the same frequency. This small gray-blue box is equipped with two gray buttons. This gate beeper uses self-learning coding. That said, the Novoferm Novotron 502 MAX43-2 remote control is compatible with the NOVOFERM MCHS43-2, NOVOFERM MHS43-4 and MNHS433-02 transmitters. Product dimensions (L x W x H) 6.8 x 3.8 x 1.1 cm Batteries: 1 CR2 requires batteries. Reference MAX 43-2 Power supply type Battery Quantity of items 2 Special functions NOVOFERM NOVOTRON 502 REMOTE CONTROL, 2 BUTTONS, FREQUENCY 433.92MHz, RECORDING IN THE RECEIVER, BATTERIES SUPPLIED ( 2 X CR2016 )