QC2.0 USB Multimeter, AmorTek J7-D USB Voltage/Amps Power Meter Tester Multimeter Test speed of chargers, cables, capacity of power banks with Timer, Suitable for 5V - 15V Devices Born for geek, change default setting in Configurations Panel. Able to work 7x24h. Compatible with QC2.0 (Quick ChargeDevice and device 3V - 15V.It's the only one in the market. Exclusive built-in speaker,any parameter exceeding the set limit,the power cut out and speaker beep. 0.96" 128x64 HD Display. Simultaneously displaying of Amp and Volt/mAh and Wh in real-time. Charging Timer Function: When time's up, speaker beeps and power cut out immediately.