ALLOSUN Portable Autorange Pen Type Digital Multimeter Meter AC DC Volt Amp Tester DMM Power supplied by 1 piece 9V (6F22) battery. (Not provided by seller) Its display is 3 1/2 digit LCD with a max,reading of 1999. The screen displays low battery logo, export quality, ultra-range overload protection, ease of use. Portable size but powful functions. It features autorange, overrange indication, auto zeroing function, integrated test leads.