1. New design and metal surface: Featuring a brand - new modern design with aluminum material and powder coating, it can prevent damage and wear. The metallic appearance makes it an elegant gift for relatives and friends. 2. High precision and high sensitivity: This alcohol tester uses a high - precision and high - sensitivity semiconductor alcohol sensor, which can produce accurate results. 3. Contactless and hygienic: There is no need to replace the mouthpiece, saving time and money. It is more hygienic as multiple people can use it without replacing the mouthpiece. 4. Safe and rechargeable: It uses a polymer battery, which is safer to store in the car. 5. Compact and portable: This professional alcohol tester is very compact and portable, and can be easily placed in a wallet or pocket. It is very suitable for weddings, parties or other social events to ensure safe driving after drinking.