Modern smart watches are effectively wearable computers that can run mobile apps and operating systems. Early models performed basic tasks like calculations but now support portable media playback via Bluetooth, phone calls, and mobile apps. Popular smart watch developers include Sony, Samsung, and Pebble. The Sony Smart Watch 3 added waterproofing and Android Wear while the Samsung Gear S was the first to include WiFi, Bluetooth, 3G connectivity and a heart rate monitor. Potential future advances include reduced size, varied functionality, and innovative new features like voice activation and video communication.