Features:
1) Smart design vibration alarm
2) Can be taken along with
3) Operates conveniently
4) Well-found functions
a) The password setup/recall
b) The password can be set up arbitrarily, insuring operate safely
c) Double keys alarm function to meet an emergency
d) The early-warming time of entrance and withdraw can be selected arbitrarily
e) Can examine the vibration signal which have no direction and from any angle
f) Sound and light hint
g) Alarm includes whistle
h) Password memory function while change the battery
5) Battery: 3s, 7# battery of AAA
6) Dimensions: 6.5 x 11.6 x 2.7cm