1.8 major functions: current, timing, electrical energy, voltage, power, temperature, power factor, frequency 2.flame retardant material, all-round buckle design, stable installation, flame retardant and 3.Full-view color screen for clearer observation 4.Dedicated metering chip The calculation data is simple, convenient and fast 5.Wide range of applications Power saving and worry-free rational use of electricity Instructions:1. and hold the M key for three seconds to enter the settings, double-click the M key to wrap, and click the M key to shift. 2. Alarm prompt setting, when the value is set, the M key for 3 seconds to save. The alarm prompt appear only when the actual test value is or equal to the set value or or equal to the set value. When the instrument has an alarm, it make a sound. At the same time, the numerical unit flash on the screen. For example, if the current is set to 1.000A, an alarm appear, and a prompt appear when the actual current used is 1.000A. Turn off the alarm prompt method: set the alarm value larger than the actual value or set all alarm values to 0. Electric energy and timing reset method: the up button for 3 seconds and the timing flashes, click the M button to clear the timing, double-click the M button to wrap to the electric energy, and click the M button to clear. Color: Black Material: ABS Package Contents: 1 x AC301 Digital Voltmeter Ammeter ( 100A-closed) 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.