Made of high quality ABS material, sturdy, and long service life. 2. Excellent impact resistance, heat resistance, chemical and good electrical properties. 3. Adopts KB-PCB double-sided circuit board, portable and easy to install. 4. The sensitive central axle roller can be touched to capture the and send out the beeping sound and light warning. 5. The indicator LED lamp is always bright and clear. Low standby power consumption, energy saving and environmental

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