Features:
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) Convenient to carry by keychain
7) Countdown and count-up timer keeps the deadline of your parking
8) 3 test steps with LED indication
9) test result:
    Safety: under 0.02% BAC
    Caution: 0.02% - 0.05% BAC
    Danger: over 0.05% BAC
 
10) Battery: 2 x AAA alkaline batteries (not included)
11) Clock: uses 1 x AG13 battery (included)
12) Size: 70 x 35 x 21mm
13) patent numberZL 2004 3 0085553.9