Specification and standard

Light Stimulator: 3 LEDs arranged in a triangle, Flash speed: 5Hz
Frequency: 4000 Hz
Identities: 90,70,50 and 30 dB free field hearing loss at 16 cms and 80,60,40 and 20 dB free field hearing loss at 50 cms.
Warble Frequency: 5Hz+5%
Sound Source: Built in loud speaker.
Mains Operation: Can be operated with an optional 12V Battery.
Battery Operation: 8 standard Penlite Cells.
Automatic Switches Off: For Battery Conservation and economy.
Tone and light stimulation: Silent touch switches.
Certificate of quality: CE and/or Equivalent.