Uk used iwatch series 6 44mm: Type Retina LTPO OLED, 1000 nits (peak). Size 1.78 inches. BODY Dimensions 44 x 38 x 10.4 mm (1.73 x 1.50 x 0.41 in). Weight 47.1 g (1.66 oz). FEATURES Sensors Accelerometer, gyro, heart rate, barometer, always-on altimeter, compass, SpO2, VO2max, Natural language commands and dictation (talking mode), Ultra Wideband (UWB) support.