3 Unknown batteries required. (included)

【Open ear Design】 These open ear earbuds that don't go in your ear transmit audio through your cheekbones. Whether you're jogging, biking or hiking, these wireless sports headphones offer the safest way to listen to music or podcasts -without blocking out ambient noise, safely on the go through ambient awareness 【Lightweight & Stable Fit】 Open ear wireless earbuds weigh 0.1 OZ, made of skin-friendly soft silicone material, keeps running relax, the open ear design helps you achieve the true painless and harmless as the earphone is no need to plug into the ear canal.With ergonomic surround and streamlined sinking design, the sports bluetooth headphones can keep on ear when running, dance, or wearing glasses 【Fast Charge & Long Battery Life】 Open ear headphones can play continuously for 5 hours and standby for 150 hours, and after 1.5 hours of full charge, it can play music for 30 hours with charging case