Apple Watch Series 2

S2 dual-core processor, Built-in GPS, Water resistant 50 metres, Wi-Fi (802.11b/g/n 2.4GHz), Bluetooth 4.0 - Requires iPhone 5 or later
Ceramic back, Digital Crown, Ion-X glass, Ambient light sensor
Heart rate sensor, accelerometer and gyroscope
Direct fire speaker and microphone, Up to 18 hours of battery life, watchOS 3