Feature: 1. EASY INSTALLATION: Equipped with an auxiliary coil plugging interface, it is more convenient to install and disassemble, allowing users to use the device more conveniently. 2. HEAT DISSIPATION DESIGN: With open window heat dissipation function, which is conducive to the guard of the chip. Equipped with a chip, if the chip is damaged, it can be easily replaced. 3. GEAR ADJUSTMENT OF POWER: The gear can adjust the power level. Users can toggle left and right to observe the strength of the indicator light of the sunroof interface, which represents the strength of the power. 4. WIDELY USED: It is suitable for open circuit detection, including fingerprint locks, password locks, swipe card locks, door access control systems, vending machines, campus swipe card machines, gaming machines, water vending machines and other scenarios. 5. INSTRUCTION: It is recommended to charge it after many times of use, each time charging for 20 minutes, 1 gear flash frequency 2 gear straight frequency. Start the switch, press it for a few seconds and then rest for a while, don't press it more than 5 times a second to prevent damage to the device. Please be careful not to touch the transmitter head during operation to avoid burns. Specification: Item Type: Coil Fingerprint Lock Maintenance Detector Material: ABS Weight: Approx. 180g / 6.3oz Battery Type: Lithium Battery (Built In) Battery Model: 421730 Battery Capacity: 1800mAh. Package List: 1 x Host2 x Coil1 x Chip 1 x Power Adapter