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The best fit. Products that benefit from lower power/voltage operation, a much longer battery life (years not months), are non line-of-sight and have a two-way operation, benefit the most from Bluetooth Smart. More importantly, its ability to connect with a large number of nodes is very helpful in IoT implementations. It is also a technology that is compatible with most consumer electronic devices right from the box.

Alternatives.
1. Want LAN technology rather than PAN? If so, ZigBee is a pretty good option.
2. Looking for something in the sub-gigahertz band? Z-wave is a good option here, as it does most of what ZigBee does but uses the 900MHz band.

Z-Wave
Z-Wave is an alternative that suits the residential control and automation market. It has a maximum range of 30 metres, a bandwidth of 40 kbit/s and operates with low latency.

The notable point about Z-Wave is that because it operates in the sub-gigahertz band, it does not interfere with Bluetooth or Wi-Fi, though it might interfere with cordless phones.

The best fit. Z-Wave is a good option if you are looking at a low-power RF radio embedded or retrofitted into home electronics like lighting, home access control, entertainment systems and household appliances. The Z-Wave wireless protocol is optimised for reliable, low-latency communication of small data packets and allows data rates of up to 100 kbps.

Alternatives.
1. Need a higher data rate? If the use-case requires higher data rates than what Z-Wave provides, Bluetooth Smart is the technology to go for.
2. Interference from cordless phones and remotes? Go for ZigBee, which uses the 2.4GHz band.

Wireless USB
Wireless USB is a technology that is targeted at peripherals and similar electronic devices. It operates in the 3.1 to 10.6GHz range and can send 480 Mbit/s up to 3 metres and 110 Mbit/s up to 10 metres. The wireless transmission techniques used in Wireless USB are very robust, as they do not interfere with or get interfered by other technologies like Bluetooth and Wi-Fi. This is due to the use of a wide frequency spectrum with extremely low power at any one given frequency and a high-power spectral density.

The best fit. The ultra-wideband signals used in Wireless USB will not be affected by nearby devices running Wi-Fi, Bluetooth, or even by cordless phones. This makes it an ideal technology to be used in the living room or work environment, where a multitude of alternate wireless devices are also in use.

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