- Crossbow Technology develops wireless sensor networks using an open Bluetooth standard and programmable "Smart I/O" devices to interface with various sensors and actuators. - Bluetooth allows wireless communication between sensors/nodes and computers/PDAs within a 10-100 meter range using low power and frequency hopping spread spectrum technology. - Crossbow's wireless sensor nodes incorporate an ARM processor, Bluetooth radio, analog inputs, and Smart I/O interfaces to allow plug-and-play connection of various sensor types to the wireless network.