LED display DC voltmeter 0.56" voltage, OPC:3-30V

Model: AD041-BL.
Screen color: blue.
Display mode: three 0.56 LED digital tube.
Update rate: about 300ms/time.
Physical size: 48 x 29 x 22mm (L*W*H).
Opening size: 45 x 26mm (L*W).
Input range: 4-30V.
Power supply: You need the power supply.
Cable length: 20 cm three wires.