Means that it can be used normally even after soaking for 30mins under water 1 meter deep. No matter rains, snows, frost or heat, it's great solar light for outdoor use. Made of high-impact ABS plastic, durable in daily use. Easy to Install & Use - No cable, no circuit. 39CM ground stake, higher and thicker, won't be covered by grass.115 ° lighting angle and 90° adjustable head make the solar spotlight optimum for Patio, Porch, Path, Deck, Pool, Yard, Garden, Garage, Driveway, Pathway, etc. Long Lifespan - With rechargeable battery; upgraded solar panel; 20% conversion rate; high quality materials, GOLUMUP solar spot lights have longer working time of up to 30000 hours.