2 wire DC voltmeter

Voltage: DC 4.5-30V 
Display: Three digit 0.56″ LED, Red color
Max. Input: DC 30V (higher than 30v has the risk of burn up)
Min. Input: DC 4.5V (below than 4.5V,measurement is inaccurate
or does not show)
Minimum Resolution: 0.01V(<10V)/0.1V(>10V)
Resolution: 1%
Size: Approx.: 48mm x 29mm x 22mm(L*W*H)
Current Consumption: <23mA