UM24C / UM24 USB Tester can measure voltage, current, power, temperature and other values and display on the 1.44" color LCD Screen. UM24 is no communication version, UM24C is conmmunication version by Bluetooth connection. 1.44 Inch color LCD display makes it easy and clear to read. Adjustable multi-angle view, more intelligent and convenient. Mini size and sandwich design structure, durable for use. Main functions: voltage/current/power/capacity/energy detection, quick charge recognition, data storage, etc. Wide applications: can be used to test power bank, charger, discharge load, tablet, mobile phone, etc. UM24C / UM24 Full-Color LCD Display Tester Model : UM24/UM24C Technical Parameter: Product Model:UM24/UM24C Product weight:23.47g(UM24C) 18.83(UM24) Voltage measurement range:4.50-24.00V Voltage measurement resolution:0.01V Current measurement range:0.000-3.000A Current measurement resolution:0.001A Capacity accumulation rannge:0-99999mAh Voltage measurement accuracy:(0.2%+1 digit) Energy sccumulation range:0-99999mWh Current measurement accuracy:(0.8%+3 digit) Load impedance range:1.5-9999.9 Time measurement range:0-99h59min59s Temperature range:-10 Temperature measurement error Screen brightness setting:0-5 level Auto screen off time:1-9mins Voltage graphing range:04.5-24.0V Current graphing range:0.00A-3.00A Display screen:1.44 Inch color LCD display Quick charge recognition mode:QC2.0 QC3.0 Refresh rate:2Hz Product size:71.2mmx31.8mmx12.4mm(UM24C) 71.2mmx31.8mmx11.3mm(UM24) Note: 1. UM24 is no communication version, UM24C is conmmunication version by Bluetooth connection. 2. PC software support PC window (Win 7 and above) and Phone Android 3, User manual, PC software installation instruction and PC software and Android APP 4, For Android APP : A: APP only support android 5.0 and above . B: Allow APP to do in the background, not be cleaned. C: allow APP self-starting. D: Allow APP stay after screen locked, not be cleaned. 5. about demo video and APP test and other function