Feature: and compact for easy portability. Micro-matte process, delicate touch, can not put down. Two detection modes can meet the needs of different occasions: the precise mode requires the installation of a blowpipe, and the detection is more accurate; the quick check does not require a blowpipe, which is suitable for multiple people to quickly check whether there is alcohol. Equipped with smart chips and high-sensitivity sensors, the measurement is more accurate. Accurate values, high-definition large-screen display, clear at a glance. USB rechargeable lithium battery can be without frequent battery replacement. Specification: Display: 2.0-inch display with dazzling green light Detection range: 0.00-400mg/100ml Detection accuracy: ±10% (mg/100ml) Warm-up time: 10 seconds Induction time: 5 seconds Alarm function: when the alcohol content exceeds the standard, the red light in the upper left corner light up, and the buzzer automatically alarm Power battery: 3.7V/200mAh rechargeable lithium battery Interface: Micro-USB (5V/1A charging) Size: about 3.5x13.5x4cm Color: Black 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.