UK/iwatch series 6 44mm: Resolution 448 x 368 pixels (~326 ppi density). PLATFORM OS watchOS 7.0, upgradable to 9.4. COMMS WLAN Wi-Fi 802.11 b/g/n, dual-band. FEATURES Sensors Accelerometer, gyro, heart rate, barometer, always-on altimeter, compass, SpO2, VO2max. Weight 47.1 g (1.66 oz).Dimensions 44 x 38 x 10.4 mm (1.73 x 1.50 x 0.41 in).