Hammer Airflow 2.0 bluetooth earphones is powered with Bluetooth v5.0 for faster and secure connection, and can be used up to 10 meters. These headphones wireless ear tips cuts the most of noise for the best experience. Hammer Airflow Earbuds 2.0 are IPX4 rated for light splashes of water, and it is advised not to use in heavy water condition, such as swimming or heavy rainfall, as it may lead to warranty void. Hammer headphones are portable and easy to carry around, and enough power to keep you charge for 12 hours. Hammer bluetooth earphone are ergonomics in design for long comfortable use.Special features- Powerful Sound Quality: Hammer Airflow 2.0 has powerful 10 mm sound drivers for a great sound experienceErgonomic Design: These wireless earphones are suitable for long comfortable usePassive Noise Canceling: These wireless headphones can block out most of surrounding noises with ear buds Portable Case: Earphone case is designed with 300 mAh battery, which can charge your Hammer Earbuds at least 4 timesIPX4 Rated: These wireless earbuds are sweatproof, so you can enjoy your workout sessions worry-free