Compact 4-button hand-held transmitter for secure radio control of Hörmann door operators with 868 MHz BiSecur or fixed code. Textured plastic surface with plastic caps - Impulse - incl. key ring, for attachment to key ring Key ring, for attachment to key ring - Protection class: for dry rooms only - Temperature range: 0 °C to +50 °C - Battery: lithium button cell 3 V/ type CR 2032 - Dimensions: 28 × 70 × 14 mm Hand-held transmitters with BiSecur technology are backwards compatible, i.e. they can also be used with operators from the BiSecur series. i.e. can also be used with series 1 and 2 (868 MHz) operators.