USB 5-digit LCD voltmeter and ammeter model AT35, digital display. Measures DC voltage from 3.700 V to 30.000 V and DC current from 0 to 4.0000 A; resistance range 1–9,999.9. Unit dimensions about 2.52 in × 0.87 in × 0.47 in (64 mm × 22 mm × 12 mm). Operated by button and intended for electrical DIY use. Brand - RD.