We left out technical parameters such as CPU, memory and battery.
The reason for the exclusion of the first one is that almost all devices with on-device processors use Texas Instruments' ARM-based IGhz+ Dual-cores, and hence this is not a differentiating factor.
Likewise, built-in memory is in most devices either absent - but available as a smart card - or low in size. Finally, all of the examined devices have a relatively short battery life, which is unsurprising given the demands of processor power and graphics rendering.
To create a device that is as unobtrusive as possible, the available space for housing a large multi-cell rechargeable battery has been minimized.
It is assumed that the applications at this stage will have low requirements on RAM, data storage and CPU processing [11].