Start your dive off right with the Aqua Lung i300C Dive Computer with Bluetooth. This intuitive dive computer syncs and stores your data with the free Dive Log app on your phone via Bluetooth. The durable dive computer goes as deep as 330ft (100m), allows you to switch up to three gases underwater, has four different operating modes, and audible alarms for safety stops. Easy-to-use interface with two buttons, bright backlight gives you quick access to temperature, depth, dive time, gas consumption, among other vital information. Water-activated on a switch, this watch is made for a no-brainer dive. Great for new divers or as a backup dive computer Bluetooth technology for quickly syncing and saving dive log information to Dive Log app Four operating modes (Air, Nitrox, Gauge, and Free Dive) Three gas computer allows you to change up to 3 gases underwater Bright backlight for easy reading Replaceable battery CR2450 lasts between 200/300 dives Settings and data are retained during battery changes Audible alarms and additional high-visibility LED warning light Specs Multiple gas Max FO2 setting between 21% to 100% Audible alarm Gauge mode Safety stop ON/OFF Deep Stop user set Logbook and history mode saved on app Temperature, Safety Stop Timer, Plan mode, calendar, battery power indicator