SMART AUDIO-VISUAL INTERACTION SYSTEM: Works with LED lights and buzzers in collaboration, Provides intuitive feedback of detection status and operation warnings. SUITABLE FOR VARIOUS SCENARIOS: Widely used in and related industrialfields. 3-COLOR TEST PROBES: This inst ent comes with 3 test probes, and the pins can be connected to alligator clips Model:SW-361 Working voltage range:60-600V Working frequency range:20Hz-400Hz Size:85mmx64mmx23mm Colour:Orange Material:ABS Package Contents: 1 * SW361 Phase Sequence Detector 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.