The Sony NW-WS413 MP3 Player is compact, lightweight and waterproof – meet your perfect training partner! Add variety to your workouts with space for around 900 songs , along with an impressive 12 hours of battery life . Ideal for swimming, running, biking and much more, this durable all-in-one walkman was designed to thrive in the most intense weather conditions. Waterproof and dustproof , the wireless headphones are sealed to protect against damage from sand, dust and grit too. You can even go swimming in them, so every form of exercise is covered. For complete flexibility, the NW-WS413 is wireless and lightweight, with an ergonomic, head-hugging design for a secure and comfortable fit, ensuring that you stay focused on your workout. Everything is incorporated into the earphone design, with no separate Walkman unit to deal with, so you can inspire your workouts without being weighed down. Benefiting from Ambient Sound Mode , this walkman enables you to hear some external sound while listening to music. This is perfect for times when you’re running or cycling alone, as well as for personal training sessions. Storing music on your Sony Walkman NW-WS413 is easy – just use the supplied USB 2.0 cradle to plug into a Windows PC or Mac, then drag and drop your music files into the folder for playback. drag and drop files. MP3, AAC, WMA and Linear PCM formats are all suitable. A quick charge of just 3 minutes and gives you a full 60 minutes of use, and a full charge has an impressive total battery life of up to 12 hours . Bluetooth: N Dongle Required: N Noise Cancellation: N Wifi Enabled: N 4GB Storage Capacity Water proof (salt water) for worry-free use Works in temperatures from -5°C to 45°C Up to 12 hours of battery life Ambient Sound Mode Quick charge - 3 minutes charge for 60 minutes use