By emitting sound wave to get rid of moles and snakes very effectively, the sound waves will irritate them, simulate danger, and repel them away from the irradiated area. 1. 3.7V 1200mAh Li-ion rechargeable battery provides enough power when rainy days (can be replaceable). 2. Garden light can brighten garden and make it more beautiful. 3. Waterproof level IP44 for outdoor use. 4. External charge: can be charged by solar power or USB port 5. Working range: about 650-800 square meters