This is a very difficult question to answer. The factors that determine how far a sound travels include humidity, temperature, the source volume and directionality, and surrounding clutter. Additionally, no two microphones have exactly the same sensitivity, even brand new.

This white paper discusses all of the factors involved in much greater detail.

• Can I use Echo Meter Touch modules with USB connectors with iOS devices?
• What type of plug does my Echo Meter Touch module have?
• What type of data port does my phone or tablet have?
• What adapter do I need for my Echo Meter Touch module and Android or iOS device?
• What iOS devices are compatible with my Echo Meter Touch module?
• How do I update the firmware on my Echo Meter Touch module with USB to add iOS compatibility?
• Are there acoustic differences between the first- and second-generation Mini Bat recorders?
• Will the Lithium-ion lids I used with first-generation Minis fit the new models?
• Will the security bracket accessory I use with first-generation Minis be compatible with the new models?
• Will Wildlife Acoustics continue to repair and support first-generation Minis with replacement parts?
• Are there size differences between the first- and second-generation Minis?
• Are there acoustic differences between the first- and second-generation Minis?
• View more questions