F21-12D radio remote controls used for bridge crane and overhead crane,easy to operate to keep workers safety. Products application: MD double speed electric hoist or double speed electric chain hoist with hook,monorails ,double hook /single speed hoist crane, and used for the industrial remote control which are under 25 connections Brief Introduction Transmitter size:239*65*65mm weight:255g Receiver size:331*160*140mm weight:1200g Specification: control distance : up to 100m unique code : over 4.3billon unique ID codes . temperature : -35°C~+80°C Enclosure protection class : IP65 Transmitter power: DC3v Receiver powder : AC 380v/ 36v/220V or DC12V/24V output capacity: Full sealed relay output with 5 amperes Standard configuration: One transmitter ; One receiver; One 1m cable connect with receiver One operation and maintain manual . Products Features: * 12 Dual speed push button +one EMGS button+one START button+one SWITCH key * control points are up to 25 *With the battery voltage alarm device to cut off the circuit when voltage is insufficient. *with the Rotate key switch to guarantee the safety. *set the internal functions by computer interface *up/down ,east/west , south/ north push button can be set mutual inhibition or not . *power button can be set start,speed up,jump strokes, ordinary etc. *spare 1-2 ,3-4 key can be set ordinary, interlock,jump strokes,switch etc.