The LTU has a self contained power supply of rechargeable nickel metal hydride batteries. Each unit comes with an ac adaptor/battery charger to suit your country, reflective shield, instruction manual, infra-red indicator and hand carry case. The entire package is light weight and completely portable. The LTU features an in-built digital timer, and audible warning device which sounds when the laser is operating, and two power settings. The LTU-904 operates with a peak power of 5 Watts.