TuxHiggs writes: Last month, Forbes wrote that Microsoft was preparing a cross-platform smartwatch with the ability to continuously track your heart rate and sync the data to your devices. A trusted source with knowledge of the development has verified some of that information and provided Tom's Hardware with additional details about the device. The source confirmed previous rumors that the device is cross-platform compatible, and added there would be open APIs as well. The source also confirmed that the display is on the inside of the wrist as opposed to the outside. Design-wise, Microsoft has gone with a slim band design that is said to resemble a thinner, flatter version of the Nike Fuelband. While details about the hardware are scant, the source did reveal that there are 11 sensors under the hood and a mix of chips, including some from TI and Atmel. Finally, the release for this device is apparently set for October.