Feature 1 With 8pcs operation buttons, 7pcs of which are single speed buttons, 1pc is total stop button. 2 With battery voltage warning devices, it can cut off the circuit by itself when the voltage is insufficient . 3 Security key switch to prevent unauthorized use. 4 Internal functions can be set by computer interface. 5 Up / down, east / west, south / north can be set to inhibit each other. 6 The spare 1 button can be set to start, acceleration, normal and other functions. 7 Up to 9 control points. 8 Anti-welding smoke, anti-metal dust, anti-oil, waterproof, anti-fall.Item Type: Wireless Industrial Remote ControllerModel: H21-E1COptional Voltage: 12-36V (low voltage), 26-635V (full voltage)Control Distance: Up to 100 metersSecurity Codes: More than 4.3 billion, never duplicateProtection Level: IP65Remote Control Battery: 2 AA batteries (not included) Package List1 x Transmitter1 x Receiver1 x Dust Cover2 x Cable Tie1 x InstructionsNotePlease note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.