BUILT-IN LARGE CAPACITY RECHARGEABLE LITHIUM BATTERY (600MAH); INTEGRATED IP67 WATERPROOF PROBE AND HOSE, BUILT-IN FLASHLIGHT (APPROX. 10 HOURS); SOUND ALARM, LOCK SCREEN BUTTON: TO FIX THE TEST RESULT ON A SCREEN, MULTI-TYPE FLUID TEST: DOT3, DOT4, DOT5.1