Contains: smart measuring pen non-contact induction pen *1 Size: 15.5*2.1*2.6cm Weight: about 0048kg Dual sensitivity and range: The voltage tester can detect voltage in two voltage ranges: 12V - 1000v / 48V - 1000v (Setting via "s" key). The probe's nvc sensor recognizes the voltage and displays it on the LED. It meets the many needs of residential, commercial and industrial environments. LED indicator and phase tracking: During the test, the voltage intensity is displayed on the indicator. The light turns red or green. If the red light is flashing, a fast cadence alert indicates that a phase has been detected. If the red light does not flash, it means that a neutral is detected. (without battery) Non-Contact Voltage Tester: Insulated voltage detector housing ensures safety. As the voltage signal strength changes, the indicator increases or decreases and the frequency of flashing and beeping becomes faster or slower with the signal strength. Shutdown function automatic and flashlight: automatic shutdown can save and control electricity; The tip is equipped with a flashlight that can be used in power-off or dark environments; The pocket clip makes it easy to attach.