b'Accessories and SparesMB SystemControls (RF)SL1963 Control unit with integrated radio receiver for one blind Quantity of blinds can be increased by expansion with control unit SL1807 up to 4 blinds at a time diam.: 48x43x21 mm (WxHxD)SL2392S159 Radio remote control Portable transmitter with LCD display up to 99 channels Colour: anthracite grey diam.: 40x128x11 mm (WxHxD)CR2430Replacement remote control battery13'