For controlling up to two third-party drives with Somfy RTS radio technology via potential-free contacts. Up to 16 radio transmitters can be programmed into each channel. The power supply can be provided directly by the drive, and an external antenna can be connected to improve the range. Operating voltage: 24 V DC Radio frequency: 433.42 MHz Protection type: IP 55 Protection class: II Operating temperature: -20 °C to 70 °C