Waterproof (Fresh or Salt water) for worry-free use. Salt waterproof to a depth of 2 metres, the NW-WS620 can be submerged for up to 30 minutes making it perfect for swimming and water sports. Works in temperatures from 23°f to 113°f Easy Bluetooth connectivity with NFC one-touch Ambient sound mode 3-Minute quick charge for 60 minutes of playback Remote control and Bluetooth connectivity cannot function underwater