Digital Brethelyzers normally sell for more than $300
Great Entertainment for Party goers to test their alcohol level.
Also a great safety Device

Features

• Easy To Read: clearly displays level of blood alcohol concentration (% BAC) in increments of .01% ranging from 0.01 to 0.40 % BAC.
  
• Compact: easily fits into your pocket, purse or day planner; same size as a cell phone.
  
• Audible Alerts: beeps when the unit is ready for use and after a breath sample registers.
  
• Advanced Gas Sensor Technology: utilizes advanced semi-conductor gas sensor technology to measure the level of alcohol in your blood via a breath sample
  

Sensor: Highly sensitive semiconductor alcohol sensor.
Power: Powered by 2x AAA 1.5v batteries.
Battery Usage Limit: Continuous use for up to 50 times.
Warm-up Time: <20s
Response Time: <5s
Dimension: 105X20X40 (mm)