... switch pael(the chair down , up, backward, forward,heater,water supply,saliva,set,reset,LP, operation light )eleven control4.operation light ... system7.Assistant control system down ,up,backward,forward,heater,water suppply,salivaseven control8.Saliva ejector with high and low ... control for handpiece speed12.floor box-for electric,air,water and drain connection13.24V noiseless DC motor chair14.dental ...