HK-809 High Sensitivity GPS Magnetic Field Electromagnetic Wave Wireless Signal Detector(Black) 1. The sensitivity can be adjusted. By adjusting the sensitivity to expand or reduce the detection range, the sensitivity is increased by 2-3 times, and the detection distance can reach 300mm 2. Anti-vibration, drop-proof, reliable and durable 3. Built-in 3.7V1600MA H18500 lithium battery, when the battery is low, the under-voltage indicator will show green, and it can be charged with a mobile phone charger that supports 5V1A 4. The mute and alarm modes can be adjusted. The more alarm lights, the closer the alarm object is, the buzzer switch is turned on, and the object can also be judged based on the sound 5. Highly sensitive chip, 1MHZ-2.8GHZ broadband can detect all locatorsmonitorstrackers, etc., and can accurately find the source of wireless transmission 6. Product material: ABS engineering plastic 7. Product size: 38x12x10cm 8. Product weight: about 275g