Samsung Gear S SM-R750 (S/K) Curved Super AMOLED Smart Watch (White) Networks- 2G GSM : GSM900, DCS1800 3G UMTS/WCDMA : B1(2100), B8(900) Display : 50.9mm Curved S AMOLED 360 x 480 / CPU : 1.0GHz Dual Core / Memory : 512MB RAM, 4GB / Audio : Codec MP3 ,AAC,AAC+,eAAC+ / Format MP3, M4A, WMA, AAC, OGG Battery : 300mAh / OS : Tizen / Network : 3G, Wi-Fi / Sensor : Acceleration, HRM, UV, Altimeter Compatible mode : Samsung Galaxy Smartphone with RAM 1GB+, Android 4.3+, Bluetooth 4.0+ &gt;&gt; S3, S4, S5, Note2, Note3, Note4, etc Function : Keyboard(QWERTY/3x4), S voice(Voice Recognation), S health(Health coach), View interactive, Call, Text, GPS, Customizable screen clock