Features: 8 major functions: current, timing, electrical energy, voltage, power, temperature, power factor, frequency PVC flame retardant material, all-round buckle design, stable installation, flame retardant and safer Full-view color screen for clearer observation Dedicated metering chip The calculation data is simple, convenient and fast Wide range of applications Power saving and worry-free rational use of electricity Instructions: 1. Press 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, press the M key for 3 seconds to save. The alarm prompt will appear only when the actual test value is greater than or equal to the set value or greater than or equal to the set value. When the instrument has an alarm, it will make a sound. At the same time, the numerical unit will flash on the screen. For example, if the current is set to 1.000A, an alarm will appear, and a prompt will appear when the actual current used is greater than 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: press 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. Restoring factory settings: Press and hold the down key, and then turn on the power and hear the sound of the meter, indicating that the restoration is successful. The factory default voltage alarm value is 275V, others are 0 Package Included: KWS-AC301: Meter X1 Transformer X1 (20A does not include transformer, the transformer is built in the instrument) Temperature sensing line X1 KWS-AC301L Meter X1 Transformer X1 (20A does not include transformer, the transformer is built in the instrument) Temperature sensing line X1 Communication cable X1