1RECHARGEABLE DESIGN: USB fast charging, charging for 30 minutes, standby for 30 days, using for 30 hours, effectively repelling for more than 90%, simple and reliable. 2ADJUSTABLE MODE: 3 gear repellent mode, 1st gear for daily indoor use, 2nd gear sports mode, and 3rd gear mute mode. Using microcomputer ultrasonic frequency, achieve the effect of interference and stimulation. 3PHYSICAL REPELLENT: Eco friendly and healthy, safe for the elderly, children, pregnant women, etc., perfect gift for loved one, parents, etc. on birthdays and holidays. 4MULTIPLE APPLICABLE SCENARIOS: Smart chip, low power operation all day, power saving, no radiation. Suitable for home sleep, night sports, fishing, outdoor camping, etc. 5PLASTIC MATERIAL: Simple and stylish, beautiful and practical. Ultrasonic repellent bracelet adopts plastic material, firm and sturdy, stable and wear resistant, durable for use.