1. 3 test step with LED indication -- Safety: under 0.02% BAC (0.1mg/l BRAC) -- Caution: 0.02% BAC (0.1mg/l BRAC) to 0.05% BAC (0.25mg/l BRAC) -- Danger: over 0.05% BAC (0.25mg/l BRAC) 2. Easy-to-use design with one-touch operation 3. Short ready time 4. Quick response and resume 5. Torch function 6. Key chain 7. Use 2 x "AAA" alkaline batteries (not included) 8. Unit size: 73(H) x 39(W) x 20(T) mm