Altec Lansing iMW575 Life Jacket Bluetooth Speaker, Blue - (Certified Refurbished) This Certified Refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon.com. IPX67 waterproof/everything proof Works with Bluetooth compatible devices or through a 3.5mm Aux jack The built-in rechargeable Li-ion battery works up to 16 hours at 50% volume with one charge NFC wireless check-in creates easy pairing and easy on/off with NFC supported devices