Orion OREV21SL1, Radio Transmitters, 2 control buttons, yellow, ip67, Radio remote control range suitable for numerous industrial applications, European frequency bands from 433 to 434 MHz with 18 possible frequencies, Programming of various functions via jumper switches or microswitch, Compact, light, robust transmitters, "On/Off" buttons on certain models, Applications: lifting, elevator table, conveyors, raising industrial barriers