The NovaTac 120P programmable flashlight with intelligent power supply lets you set brightness levels and signaling features. The light output on the NovaTac 120P is automatically reduced to preserve the battery as it runs down. You can also adjust the brightnes level to suit your situation or to conserve power. At the lowest output level the Novatac 120P will run for up to ten days on a single CR123A lithium battery.Specifications