Features USB INTERFACE TESTER: This multifunctional USB tester can detect the voltage, current, and battery capacity of the USB interface, meeting various needs. DETECTION RANGE: The voltage test range is 4‑30V, the current range is 0‑3A, the capacity range is 0‑99999mAh, with 0‑99 hour timing, compact and practical. HIGH ACCURACY CHIP: This USB tester uses high accuracy chip to ensure accurate and stable measurement results, greatly improving detection efficiency. CIRCUIT PROTECTION: This tester has reverse connection protection to avoid damage caused by improper use, with power off protection (save data once per minute). COMPACT SIZE: This multifunctional USB tester is compact and lightweight, which is easy to operate and carry, suitable for various electronic device detection. Specification: Item Type: USB Tester Material: PC Voltage: 4-30V Current: 0-3A Timing: 0-99 hours Capacity: 0-99999mAh Function: Power Off Memory (save data once per minute) Application: Suitable for various electronic devices Package List: 1 x USB Tester Package List 1 x USB Tester