Welch Allyn . Fast, accurate results–about 10 seconds per ear. Objective testing–no patient response required. Clear results that don’t require caregiver interpretation–Pass/Refer result provided by instrument. Portable, reliable design gives you increased confidence and flexibility. 10-test memory storage in device. Simple printer interface for easy patient data documentation.Patient information can be downloaded into a PC ASCII file. Optional power supply: rechargeable lithium battery or AC power. 1-year warranty, extended warranty available.