This is a professional digital breath alcohol tester. High quality with high accuracy and sensitivity, capable of responding within 5 seconds. Features a port for inserting a mouthpiece. Designed for health and convenience. Features: 1. Uses a high-precision and sensitive semiconductor sensor 2. Large screen display with three LED lights 3. Five test unit options: %BAC, BAC g/L, mg/L, mg/100mL 4. Loud alarm sound 5. Auto power-off Display: Red digital display with black background and 3 LED lights Sensor: Advanced flat-surfaced alcohol sensor Warm-up time: Within 10 seconds Response time: Within 5 seconds Operating temperature range: 5°C to 40°C Detection range: 0.000–0.199% BAC / 0.00–1.99 BAC / 0.00–0.99 mg/L Digital display results: %BAC / BAC / mg/L Power input: 3V (3 x "AAA" alkaline batteries, not included) Net weight: 85g Dimensions: 112 x 60 x 30mm Package weight: 170g Package size: 164 x 116 x 48mm Package included: 1 x Alcohol Tester 1 x Instruction Manual 10 x Mouthpieces 1 x Tester Bag