Tianniu F21-E1B DC12-72V Industrial Remote Controller Switches Hoist Crane Control Lift Remote Control with One and One Receiver

e has 8 function buttons (6 single speed buttons + 1 start button + 1 stop button).
e number of control poin of e can be up to 8.
e has a safe key switch to refrain unau orized use.
e can be connected to e computer rough e data cable to set e button function mode.
e has a battery voltage warning device, and e voltage is insufficient to automatically turn off e circuit.