It can be used as a USB tester or as a DC voltmeter. It is a high-end product created by the wisdom of the industry! UD24 2.4 inch USB tester DC5.5 type-c digital voltmeter ammeter power bank voltage detector volt QC PD electric meter for APP. Voltage measurement range: 5V - 32.0V. Synchronization time: 999 hours 59 minutes 59 seconds Input interface: Type C / Micro-USB / USB Output interface: Type C / USB Time charging reminder setting: Countdown 24 hours any set value USB D + voltage range: 0V - 2.99V USB D-voltage range: 0V - 2.99V Update time: more than 500mS / times Measurement rate: about 0.5 times / sec Alarm mode: siren sound + double display warning warning Display type: 2.4 high cost digital display large screen with Chinese and English measurement interface Self-consumption current: less than 0.02a Working temperature: -10 ℃- + 60℃ Operating humidity: 10 - 80 () Working pressure: 80 - 106kPa Colour:As Shown Material:plastic Package Contents: 1 x UD24 teter(Due to different product batches, the appearance , which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.