Features: Experience enhanced focus and obvious sound with Schumanns Headphones, featuring programmable 0.1Hz to 30KHz frequency tuning and noise canceling earphones for optimal sound execution in any environment. This smart sound set combines digital circuit crystal oscillator technology with a compact storage case, delivering stable 7.83Hz Schumanns output and anti intervention execution through USB powered process. Ideal for office advisors, students seeking study concentration, and audiophiles requiring premium sound quality during commutes or travel adventures. Transform noisy workspaces, daily transit routines, or leisure trips into immersive sound zones using the portable design and quick USB connectivity to power banks/adapters. The stable plastic and fabric construction ensures long lasting execution across multiple environments, while detailed frequency adjustment instructions on packaging enable effortless customization. Specifications: Materials: PCB Supply voltages: 5V Default frequency: 7.83Hz interfaces: MicroUSB port rateds power consumption: <0.5W Adjustment ranges: 0.1Hz~100000Hz Size: 15.4x10.5cmx2.5cm/6.60x4.13 x0.98in Package Includes: 1x Schumanns Frequency Generator 1x Headphones 1x Storage bag note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.