Important notice1. We recommend using the earphone in water for no more than 45 minutes each time, and spin it to expel the water after each use. 2. Sound quality may not be good as other ordinary earphones due to its waterproof design on the driver. If sound quality Comes first to you, Please think it over before purchase. Avantree Tr509 is a IPX7 waterproof earbuds, perfect for swimming, surfing, paddle boarding, kite boarding and other water sports. Thanks to its waterproof driver diaphragm protecting earphones away from water well, you are with 45 min use 1M underwater. Cd-like sound will be around you while swimming with this waterproof earphone. Specification> * Speaker Size: 8. 6Mm * power: 5Mw> * Sensitivity: 1093db * impedance: 32ω15% * cable length: 80cm what's in the box? *avantree tr509 * spare ear tips compatibility> iPhone, iPod, iPad, smart phones, MP3 players, tablets and other devices with 3. 5mm audio jack > we offer 24 months for normal use. Live online support, Telephone Support, and email support are available. Video user guide are available also from Avantree site. Support any issues or suggestions, contact us via our US toll free no, Intel number, or email us and 1 business Day reply is . We are committed to 100% customer satisfaction.