Recommended Setup: Position the device at 3.3 to 4.9 ft (1 to 1.5 m) height for a working range up to 16.4 ft (5 m). For large rooms or open areas, use two units for full coverage. Best in quiet settings; effectiveness may drop after intense activity or in noisy places such as live DJ events
Compact and Portable Design: This plug-and-play sound frequency generator measures 5.9 x 5.5 x 1.2 inches Its USB Type-C connectivity ensures instant operation anywhere. Note this product does not come with a protective case or a power outlet
Frequency Testing Instructions: Schumann wave detector has a response range of 1 to 100 Hz. Place the detector at the center of the product. If the set frequency is outside this range, it is normal for the detector ball to show no movement. Headphones have a response range of 1 to 15 kHz. If the set frequency is outside this range, it is normal to hear no sound from the headphones. Note that Schumann wave detector and headphones have no other functions besides the detection purposes described above