STROBOSCOPE Features: Internal, fast-charge rechargeable battery supply Aluminum construction provides exceptional durability High polish and focused reflector eliminates “blind” viewing areas External trigger allows unit to be automatically synchronized with equipment Continuous duty cycle eliminates need to shut down for cooling Phase shift allows visual analysis of rotating/reciprocating objects High accuracy ( ±0.01% of reading ) is ideal for QC inspection and process control Synchronous output enables strobe to drive other strobes Flash timer control conserves flash tube life Easy tri-pod or permanent mounting with integral mounting thread The microprocessor-controlled DT-315A possesses the same great features of the DT-311A with the added convenience of total portability via its own internal power supply with up to one hour of full time, high intensity flash rate. Powered by rechargeable batteries located inside its rugged aluminum housing, the DT-315A also performs as an AC line-powered strobe when plugged into its standard AC adapter/charger unit. Includes: Fast Charger 1 Year Warranty User Manual