For controlling up to two third-party drives with Somfy io radio technology using potential-free contacts. Up to 16 radio transmitters can be programmed per channel. The power supply can be provided directly from the drive. An external antenna can be connected to improve the range. Operating voltage: 24 V DC Radio frequency: 867-870 MHz Protection type: IP 55 Protection class: II Operating temperature: -20 °C to 70 °C