Tech specs and what comes in the box

Band Material Thermal plastic elastomer silicone vulcanate (TPSiV)
Display Type AMOLED
Battery Life 48 hours of normal use; advanced functionality like GPS use will impact battery performance
Battery Type Li-Polymer
Maximum Operating Altitude -300m to +4877m
Sensors
Optical heart rate sensor
3-axis accelerometer/gyro
Gyrometer
GPS
Ambient light sensor
Skin temperature sensor
UV sensor
Capacitive sensor
Galvanic skin response
Microphone
Barometer
Connectivity Bluetooth 4.0 (Low Energy)
Charge Cable Connector Custom charge cable
Display Size 32mm x 12.8mm
Resolution 320 x 128 pixels
Average Charge Time full charge in less than 1.5 hours
Operating Temperature Ranges -10°C to 40°C (14°F to 104°F)
Warranty 1 year limited warranty; additional statutory rights may apply in your country
Additional Technology Haptic vibration motor
Supported mobile devices Works with Windows Phone 8.1 update, iPhone®: 4S, 5, 5C, 5S, 6, 6 Plus, iOS® 8.1.2, and many Android 4.3 or later with Bluetooth®
Water Resistance Water Resistant