Reveals a World of Sound Unheard by humans

This amazing detector picks up ultrasounds that are normally inaudible to the human ear. Tune your detector into the hidden sounds that surround us such as combing hair, fluorescent lights, rattling keys tearing paper, rubbing fabric and of course bats.

Requires 1×9V battery (not included).

Features:

• 20,000Hz to 100,000Hz frequency range
• Frequency and volume controls
• Lightweight hand-held unit
• ON/OFF switch.

Suitable for ages 8 years and up.