1) Design patent
2) semiconductor sensor inside
3) warm-up time: within 10 seconds
4) response time: within 5 seconds
5) Operation temperature: 5-40 ℃
6) Clock with 12 / 24 formats
7) Alarm time function
8) Convenient to carry by keychain
9) 3 test steps with LED indication
10) test result:
a) Safety: under 0.02% BAC
b) Caution: 0.02% - 0.05% BAC
c) Danger: over 0.05% BAC