Only compatible with the NOVOFERM NOVOTRON 433.92MHz models listed below: For Novofer Novotron: 502 MAX43-2, 504 MAX43-4, 512 MIX 43-2. For Novoferm: MCHS43-2, MTR43-2, MNHS433-02, MNHS433-04. For Mini Novotron: 522, 524, 522 Design, 524 Design Product details: Frequency: 434.92 MHz. Number of buttons: 2. ● Size: 6.9 x 3.8 x 0.9 cm. ● 3V CR2016 lithium battery included. Excellent customer service.
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