1.Anti-lost function
2.Searching function
3.Alarm with vibrating
4.Not disturbance mutual
5.No-radiation
6.Free contron within 0-25 metres for the guard against articles
1.Anti-lost function
2.Searching function
3.Alarm with vibrating
4.Not disturbance mutual
5.No-radiation
6.Free contron within 0-25 metres for the guard against articles