Feature: 1. It can test charger output current, output power, output voltage. 2. It will alarm to you if the voltage or current is out of the safe range to protect your device. 3. It can be used to measure U disc current, USB interface voltage, power bank, etc.. 4. LCD Screen allows you to be clear at a glance, displaying real time data. 5. 10 groups of data storage. 6. It can test output current, output power, output voltage. Specification: This UT658 USB tester is designed for 3C products, such as wall charger, portable charger. And it is also designed to improve charging efficiency and protect your devices scientifically. Features: It can test charger output current, output power, output voltage. It will alarm to you if the voltage or current is out of the safe range to protect your device. It can be used to measure U disc current, USB interface voltage, power bank, etc.. LCD Screen allows you to be clear at a glance, displaying real time data. 10 groups of data storage. Specifications: DC Voltage: 3.0V-9.0V DC Current: 0.0A-3.0A Capacity: 0-9999mAh Data Storage: 10 sets Work Temperature: 0℃~50℃ Drop Test: 1m Item Weight: 27g / 0.97oz Package Weight: 31g / 1.09oz Item Size: 8.3 * 2.8 * 1.2cm / 3.27 * 1.10 * 0.47in （L * W * H） Package Size: 8.4 * 3.2 * 1.4cm / 3.31 * 1.26 * 0.55in （L * W * H) Package List: 1 * USB Tester Package List: 1 * USB Tester