Maximum beam length: 7.5 Metres Operating time: from 1.5 to 12 seconds Large range of fluid pump provide variations in speed of operation DurabiltyAll the materials used in the manufacture of this product have been chosen for their resistance to corrosion Anti - Crush ProtectionThe two pressure adjusting valves incorporated within this unit allow accurate adjustment of the working pressure to a safe level, thus providing a constant level of personal protection. Slient & SecureThe Vela self contained drive unit consists of:An electric motor and fluid pump sitting in an oil (bath) reservoir These are coupled to the rotary drive unit and a valve block.The beam is balanced by an adjustable spring. Manual ReleaseIn case of a power Failure, the operator's internal locking can be released using a special key.