Proving Unit Alert Type Light Display Screen Type LED Display Type Digital Features 5 Stepped Nominal Output Voltages Automatic Operation Extended Battery Life High Output Power Suitable for Test Lamps Magnetic Base Rugged Case For Use With Multimeters Frequency Rating 50 Hz Maximum Operating Temperature 104 Degrees F Maximum Output Voltage 690 V AC Voltage Type AC Battery Chemistry Alkaline Battery Size AA CAT Safety Rating Not Rated Includes Batteries Yes