Feature: 1. HIGH FREQUENCY: Fingerprint lock tester generates a high frequency electromagnetic wave field. Energy saving lamps induce electromagnetic waves to generate current. 2. PRE USE TEST: No electricity is required to light the high efficiency bulb. When the instrument is close to the light emitting tube part of the lamp, the lamp will light up. 3. APPLICABLE: Used in laboratories, electronics research and development and other factories to test electronic motherboards for anti interference testing experiments. 4. EASY TO USE: Coil EMP electromagnetic pulse tester built in reinforced antenna and external high frequency antenna. Charging time is only 1.5 hours, very easy to use. 5. WARM TIPS: Do not touch the transmitting power coil of the instrument, as this will reduce the power and affect the use of the instrument. Specification: Item Type: Coil Tester Material: ABS Typical Application: Fingerprint Lock Antenna Mode: Built In Reinforced Antenna, External High Frequency Antenna Charging Time: 1.5 Hours. Package List: 1 x Coil Tester 1 x Power Adapter Note: 1. Pay attention to the use time. Do not use for more than 10 seconds at a time. Allow to cool for 20‑30 seconds after 3 consecutive uses to prevent burning due to high temperatures.2. Please do not touch the metal emitter part when using, it may burn your hand.