3.3 cm / 1.3 "Super AMOLED display Bluetooth, WLAN, NFC, GPS, dust and splash water protected Sport functions with activity detection and GPS route recording Heart rate monitor Compatible with many Galaxy, Android and iOS smartphones. More than a watch: The Smartwatch Galaxy Watch - 46mm is high-tech for the wrist. Thanks to the display with a 1.3 inch (3.3 cm) display diameter, the smartwatch offers enough space for all important controls and information. The Super AMOLED technology of the SAMSUNG with a resolution of 360 x 360 pixels ensures a colorful and at the same time extremely high-contrast display. A dual-core processor guarantees sufficient performance for smoothly running programs and background processes. There is 4 GB of internal storage space on the smartwatch for data and programs. The manufacturer ships the Galaxy Watch - 46mm with the operating system Tizen OS. The operating systems Android 5.0 (Lollipop) and iOS 9 are also supported. The barometer can measure the air pressure. Movements and positions are precisely determined in the watch by a gyroscope, which means that the display changes between portrait and landscape format if necessary. With the ambient light sensor, it also adapts itself to the lighting conditions of its surroundings. Thanks to the built-in acceleration sensor and optical heart rate monitor (PPG), the watch is a practical companion for sports.