6  buttons: 4 double speed button +1 urgent stop button+ 1 “start” button. Size: L*W*H( 156*61*51)mm Weight: 320g (exclude battery) Battery: 2 pcs  1.5V AA Alkaline. Battery safety protect: it auto power off when power is not enough. Safety key is used to avoid usage by unauthorized.  The feature of receiver: Size: L*W*H( 185*85*85)mm. Weight: 550g (include 1.5meter cable) Input voltage: AC 24/48/110/220/380V, DC 12/24/48V.