product description:1.Solar - PoweredOperated by solar rechargeable battery. The 4 hour charging solar mole removal ultrasound is enough to keep them working for many days.2.WaterproofRepel Gophers solar panel is protected by waterproof ABS plastic case. So mole removal works fine even in rainy days. Keep solar panels clean - wipe them regularly with a damp cloth. Dirty panels reduce available sunlight to charge device batteries.3.SAFE FOR CHILDREN AND PETNo chemicals or toxins are used in this process; humanely repels moles and causes damage to lawns, plant grounds, flowers and nursery plant roots. Completely safe for humans and pets.4. [Wide coverage] This product is suitable for open grasslands, parks and other open areas. The effective range is about 300 square meters. The closer the effect, the better the effect. It is recommended that if the garden is relatively large, use 2- 3 products work better.5.Safe and ReliableNo noise and no radiation, you can use it with confidence.