... making,high quality,stable function CE,ISO 9001 21-E1B CURRENT SERIESTransmitter and Receiver21-E1B is one ... long distance of CD, MD, LD, JHHM, BHHM type electric hoist, endless chain electric hoist, monospar, double ... girder, tower crane, gantry type of jib crane and other multifunction industrial devices.The ... without blind operation. Wireless remote controller (21-E1B)