Nixon Ultratide Digital Watch - Monitor Tides Realtime THE WORLD'S FIRST REAL-TIME SURF CONDITIONS WATCH. CASE: 45mm wide, BAND: 30-25mm tapered Lithium Coin Cell Battery Requires No Charging, Super Crisp Digital Read Out, Easily Invert Between Positive Or Negative Display Screens Custom-built digital module, with data provided by Surfline. It features a high-resolution display that stays continuously updated with current Surfline forecast data for your favorite surf spots around the world. Bluetooth compatible to sync to phone. 100 METER WATER RESISTANCE Great for surfing, snorkeling or spear fishing Patented locking looped and steel buckle.