3.1.3 Group Call ............................................................................................... 16
3.2 Monitor .............................................................................................................. 16
3.3 Unlock Function................................................................................................. 16
3.4 Issue Card ......................................................................................................... 17
3.5 Compensation of Light....................................................................................... 17
3.6 Vandal Proof ..................................................................................................... 17
3.7 Restore Backup ................................................................................................. 17
4. FAQ 18
Appendix 1 Technical Specifications ....................................................................... 19
Appendix 2 Toxic or Hazardous Materials or Elements .................. 错误!未定义书签。