Bob Beck Brain Tuner Features: Power supply: 9V battery Color: option 1 white+orange, option 2  black+gray Frequency mode: Option 1: Three modes MODE 1-3 (550 uS pulse width) Mode 1: 1,000 Hz modulated by 111.11 Hz, Output = 1 Second ON, 1 Second OFF (0.5 Hz) Mode 2: 1,000 Hz modulated by 111.11 Hz, Output … Continue reading Bob Beck Brain Tuner for sale 失眠治疗仪