1[Long Battery Life] The charging case has built in 350mAh rechargeable battery, and the Bluetooth earbuds can be used for 3 to 4 hours on a single charge, automatically charge once placed in the charging case. 2[Bluetooth 5.3] The wireless earbuds adopts Bluetooth 5.3 technology, ensuring fast, stable and efficient transfer, take out the left and right earbuds from the charging case to connect quickly, enjoy stereo sound for calls. 3[Wide Compatibility] The true wireless stereo earbuds can connect to laptops, tablets, smartphones, and other Bluetooth enabled devices. 4[IPX7 Water Proof] Sweat or rain will not damage the wireless earbuds, suitable for sports, fitness, travel. Please note that the charging case is not water proof. 5[Ergonomic Design] The in ear earphones are ergonomically designed, can comfortably fit in your ears, allowing you to focus on exercise. Item Type: Bluetooth Earbuds Material: ABS Color: Black Bluetooth Version: 5.3 Transfer Distance: 10m Play Time: 4 hours Earbuds Battery Capacity: 40mAh lithium cell x 2 (built in) Charging Case Battery Capacity: 350mAh lithium cell (built in) Use: Mobile phones, tablets, laptops and other Bluetooth enabled devices 2 x Bluetooth Earbuds 1 x Charging Case 1 x USB Cable