... Batteries(3.7V DC2800mAh), more reliable, and work 15 hours Easy for use that the train is almost ... TesterVideo TestSignal modeNTSC/PAL (Auto Adjust)Display2.8 inch TFT-LCD ,960 x 240 resolutionLCD adjustAdjustable brightness, contrast, ... 3.7V DC2800mAhRechargeable4 hours recharging time, work for 15 hoursLow ConsumptionSleeping mode, display battery power stateOther ParametersWork Temperature ...