AVICHE M1 Necklace Wearable Mini Personal with USB Negative Ion...
(as of [price_update_date] – Details)
Power Source: Electrical
Large battery: This Air Necklace is a high efficiency, and energy-saving, more than 80 hours of battery life
Work Noise: This product will produce sound（Beeping） when it is working. Because of its working principle, it will definitely produce sound, but the sound level is acceptable.