Which hand switch can be used on the C-arm?

There is a customer who wants to buy a hand switch for use on the C-arm, and wants us to recommend one to him. Ask the customer whether he wants a two-speed or three-speed hand switch. The customer asks a two-speed and a third-speed hand switch. What is the difference, tell the customer that the two-speed hand brake switch is usually the first step to control the exposure preparation state, the second step controls the exposure, the third-speed hand brake switch is the same in the first two steps, and the third step is to control the collimator. Or other.
Customers usually buy more types of hand brake switches, and tell them that generally our L01 and L02 two-speed hand brake switches are sold more often. Customers want to see the information and pictures of our hand brake switches. After sending the information to the customer, wait for the customer to choose.