Advanced flat-surfaced alcohol sensor. Quick response. Smart MCU control. Broad range. Auto warning beyond pre-set limit. Safe,Accurate,Dependable. Works EVERY time. Digital Output. Large LCD screen. Power saving design. Low battery alert. Mouthpiece not necessary--simply blow into for 3-5 seconds Compact and design--fits into purse or pocket easily. Easy to use. Directions detailed on screen: Wait, Blow, Test, Read Range: 0.00-0.20BAC%; 0.00-2.00g/L, 0.00-2.00BAC; 0.00 to 1.00mg/L; 0.00-200mg/100mL Alarm level: 0.05BAC%; 0.50g/L; 0.50BAC; 0.25mg/L; 50mg/100mL Accuracy: 10% F.S Power by: 3x AAA batteries. (Batteries are not included.) LCD Size: 1.7inch Color: As Shown Material: Metal+Plastic Package Contents: 1 x Alcohol tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.