Come and Check Our Branding Solutions.This product has high sensitivity chip and precision chemical sensor, which can accurately measure the alcohol content in blood. The air blowing type can avoid the breeding of bacteria in the pipe blowing type, and there is no contact during the pipe blowing process. All operations can be solved with one key, and the operation is simple. It also has CE certificate, which is safe and reliable. Note: the original package of the product does not contain batteries Pls check inventory and detailed info before placing your orders.