and hard beta rays

which can be used to clean narrow spaces such as gaps

Detecting metal size: A one-yuan coin can detect 3 cm

or Pair Set before ordering

Position the projector directly in front of the screen

Smart Watch with Bluetooth Calling – Heart Rate, Fitness and Activity Tracker Color:Silver and hard beta raysProduct information: Screen size: 1. 3 inches Interface: USB 2. 0 Body memory: 64MB+64MB Screen material: smooth touch Wearing style: wrist strap Compatible system: Android platform Communication function: support Menu language: Support 18 languages: English (default), simplified Chinese Wireless distance: 5m (inclusive) 10m (inclusive) Battery capacity: 300mA Operation mode: touch + button Product size: 1. 3 inches Screen resolution: 240*240