OMNI 7000, Flashing Strobe Prism in Canister. (No Mount) Totally self contained Omni Prism. All electronics and power supply are housed within the prism canister. This unit is designed to be used in all offsets (see instruction manual to achieve correct offset). Holders from other manufacturers must be compatible with M 20 thread type. For use in adverse weather conditions, accident investigation mapping, tunneling, mining, night surveying and construction, for locating gear. Battery life, under normal conditions, is 7 days (24 hours).