Meet Hexiwear: a smart wearable development kit that allows designers to bring their ideas to life. It has a smartwatch form factor and 6 on-board sensors for you to get started. You get a heart rate monitor, accelerometer, gyroscope, magnetometer, and humidity/light/temperature sensors. The device is compatible with iOS and Android devices.
Hexiwear has a OLED screen and an onboard rechargeable battery. You can add from up to 200 sensors through click boards. More information is available here.