The mini radio handheld transmitter (key chain) FS3 HS 1 serves as a handy remote control for Schalk receiver relays and radio dimmers of the FE3/FD3 series. The transmission address is set using a DIP switch. It can be set to be compatible with the other handheld transmitter types if they are used in parallel. The transmission power enables a free field range of 30m., Compatible products: radio receiver FE3 series, radio dimmer FD3 series, repeater FV2 R., Dimensions: 57x35x11mm, Spec.: 3V DC, 1 channel (1 button)