B800LI Clip-on HD Noise Reduction Recording Pen, Support TF Card & One-key Recording & OTG, Capacity:8GB(Black) Filter-Recording Pen Working principle: The transmitter is

Working principle: The transmitter is installed outside the door

Long distance transmission 200-300 meters in the open field

Scope of application: car detection

signal detection

Charging time: about 3 hours

B800LI Clip-on HD Noise Reduction Recording Pen, Support TF Card & One-key Recording & OTG, Capacity:8GB(Black) Filter-Recording Pen Working principle: The transmitter is1. Independent recording button, one key recording, one key saving, prevent misuse, adapt to various environments 2. 384kbps recording, clear and natural, reducing distortion 3. Switch between voice control and normal mode 4. Approximately 60 meters recording distance, you can record when you hear it 5. Digital encryption technology makes recording more secure 6. Back clip design, easy to carry 7. Support Android mobile phone OTG connection, mobile