1. The signal generator is small in size, has many functions, easy to operate and easy to carry.2. The key layout is reasonable, all functions have independent corresponding keys, easy to operate.3. Built-in battery, low power consumption, long standby time.Feature:True RMSNCV/LiveLow Battery Indication: 2.7VData HoldAuto Power OffAcousto-optic indication: NCV/continuity/battery power