100% and high quality Portable and durable, easy to carry, lightweight Exhale air alcohol content tester is a professional device for testing alcohol in human breath. The sensor is an advanced HANWEI electronic nano semi-conduct alcohol sensor with good sensitivity and excellent repeatability. The testing program is controlled by an AI-designed microcomputer, ensuring a reasonable, simple, and efficient working process. Full-featured with multiple application capabilities. Backlight LCD digital display provides clear and direct readings. Compact and portable design for convenient use. When the detected breath alcohol content exceeds the preset value, the device emits an audible alarm to alert the user. Advanced flat-surface alcohol sensor Quick response time SMD assembly for stable performance Direct testing process with LCD indication Digital LCD display with blue backlight Portable and stylish design Audible warning when limit is exceeded Sensor fault self-check function Battery-saving design with low voltage indicator Digital LCD display Specifications: Sensor type: Nano semi-conduct alcohol sensor Working power: DC 4.5V (3 x AAA battery) Undervoltage display: Vcc < 4.2V