Description:suitable for all types of audiometers for air conduction testing and testing, stable frequency of listening, high sensitivity, testing Accurate resultsSpecification:Item Type: Handheld AudiometerMaterial: ABSPurpose: A test tool used to test how much sound a people can hearStyle: Light weight, easy to operate, easy to useBattery Type: 3 x AAA Batteries(Not Included)How to Use:1. Place the 3 AAA batteries in the battery box2. Press and hold for 3 seconds to turn on the device3. Press the button to select the frequency and sound, and cover the people ear with a gasket for testing4. Long press for 3 seconds to shut downPackage List:1 x Audiometer1 x Spare Pad1 x Storage B