Two pairs of two remote controls, two control two remote controls, two rounds of two closing Industrial remote control 
Two transmitter control two receivers, a group using a spare to ensure trouble-free operation of the device, the device is particularly suitable for high reliability applications, such as iron and steel, casting, printing and dyeing, chemical workshop hoist, lifting equipment. 
F21-E1B TELECRANE Six Road Industrial remote control, crane remote control of the product known as: Industrial remote control crane remote control wireless remote control driving lever handle remote CD hoist electric hoist remote control remote control remote control switch. Pull the handle can be used to replace the original console or cab to realize wireless crane operations, improve safety, reliability, convenience, efficiency of operations, improve working conditions, reduce labor intensity.

Transmitter (handheld) 
Dimensions: 16.4 × 7.5 × 4.6 cm Weight: about 320 grams receiver Size: 18.5 × 8.5 × 8.5 cm Weight: 550 grams with 8 action buttons, including 7 Single-speed keys, a total stop with a battery voltage warning device when voltage is less than its own circuit; 
Control distance: up to 100 meters; 
Security Code: 4300000000 kinds of factory and never repeated; 
Operating temperature: -35 ℃ to +80 ℃ (without regard to battery temperature); 
Protection class: IP65; 
Transmitter Power: DC 3V (two alkaline batteries can be used four months); 
Receiver Power: AC 380V \ 220V or 36V; 
Output contact capacity: 5 amp sealed relay output (AC 250V/10A relays 5 amp fuse). 
This model has more than 350,000 total units used worldwide, is the world's most economical and durable industrial remote control.