The TomTom Spark Cardio + Music lets you train with music, not with your phone. Features 3GB of music storage, audio feedback, a built-in heartrate monitor, 24/7 Activity tracking, GPS tracking, multisport mode and automatic sleep tracking. Workout with music, not your phone: carry 500 songs without carrying your phone. Thats 3gb of music wrapped around your wrist. So you can listen to your favourite playlists straight from your watch. 3GB memory. Connectivity Proprietary operating system. Bluetooth 4 connection. USB 2 connection. Display information LED screen. Battery 5mAh battery capacity. Typical usage time of up to 0.25 day. Low usage time of up to 21 days. Physical specification Size H143, W3.5, D11.5mm. Weight 49g. Features Water resistant. Dust resistant. Scratch resistant. Music player. Heart rate monitor. Pedometer. Accessories included: tomtom watch charging cable.