Batteries included, so it’s ready to use out of the box.
Brand: ZENOWELL; electronic device; no high-concerned chemicals.
Safety and care: Do not use if you have epilepsy or a history of epileptic seizures, a pacemaker, if you are pregnant, or under 18; stop use if dizziness or skin discomfort occurs. Check ear electrodes every 3–6 months; store in a dry place; avoid direct sunlight and high temperatures.
