Sacred Frequency Generator (La Forge Digital)

Sacred Frequency Generator is a compact Schumann 7.83 Hz frequency generator board (also 432 and 528 Hz presets) with 2 silent coils, a 3.5 mm pure-sine audio output (0.01 Hz to 100 kHz), keypad, LED display and Micro USB 5 V power. Designed for meditation setups, sound experiments and maker projects. From $69 / 59 € with free worldwide shipping and 14-day returns. French store: https://generateurfrequence.fr. The keypad and LED display let you set the output frequency directly on the board, and the pure-sine output connects to any audio input.