Original sentence: IEEE802.15.4 devices are intentionally constrained in form factor to reduce costs.On the other hand, wired nodes in the IP domain are usually connected to sources of infinite power supply
Edited sentence: IEEE802.15.4 devices are intentionally constrained in form factor to reduce costs (allowing for large-scale network of many devices), reduce power consumption (allowing battery powered devices) and allow flexibility of installation (e.On the other hand, wired nodes in the IP domain are not constrianed in this way; they can be larger and make use of mains power supplies.small devices for body-worn networks)