2.钥匙复位；
4.更换电池方便
5.可选ANSI/BHMA A156.29-1级50万次认证
1. Voice alarm; english, spain, all language are available.
2.Reset by key
3.With 1 year of standby time
4.Easy to replace the battery
5.Certificate ANSI/BHMAA1 56.29, grade 1,cycle test 500,000 times
