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www.scienceabc.com/innovation/what-is-the-range-of-bluetooth-and-how-can-it-be...

Range of Bluetooth is dependent on its class and primarily there are three classes of Bluetooth: Class 1 transmitting at 100 mW with a range of 100 meters or 328 feet.; Class 2 transmiting at 2.5 mW with a range of 10 meters or 33 feet (most Bluetooth headsets and headphones are common Class 2 devices).; Class 3 transmitting at 1 mW with a range of fewer than 10 meters.

blog.nordicsemi.com/getconnected/things-you-should-know-about-bluetooth-range

When Bluetooth low energy (BLE, formerly called Bluetooth Smart) hit the market in 2011, the key advantage over earlier versions was lower power consumption over the same range, but with lower bandwidth. It’s intended for devices that only need to exchange small amounts of data periodically, extending battery life by months or even years.

stackoverflow.com/.../calculate-distance-between-bluetooth-device-in-android

The Bluetooth signal strength distance relation depends on the devices (built-in Bluetooth device, antenna, actual orientation of device), current way the persons hold their devices, objects in-between... You could measure this for a pair of devices for a given situation and use these information. A larger and more general solution would incorporate an external Bluetooth network.

us.community.samsung.com/t5/Galaxy-Watch/Galaxy-active-2-watch-bluetooth-only/...

Solved: On the Galaxy Active 2 watch, will I be able to answer phone calls and talk thur my watch using bluetooth, if the phone is near me - 812053

profandroid.com/network/bluetooth/range-of-bluetooth.html

Some users may not like their range of Bluetooth module (for example, when you are at home and the phone is behind three walls, your headset loses the connection to your smartphone). In such cases, many people are looking for a solution to this problem, trying to find a way to extend the range of Bluetooth on Android.

support.apple.com/en-us/HT204562

If Bluetooth isn’t available, your Apple Watch will try to use Wi-Fi. For example, if compatible Wi-Fi is available and your iPhone isn't in Bluetooth range, your Apple Watch uses Wi-Fi. If Bluetooth and Wi-Fi aren't available, and you set up a cellular plan, cellular models of Apple Watch can connect to cellular networks.

www.zdnet.com/article/how-to-boost-your-bluetooth-signal-to-cover-your-entire...

Bluetooth is a great technology for connecting together devices, though it has one limitation – range. But you can fix that! Here's how to spread a Bluetooth signal all around your home and office.

www.quora.com/What-is-the-distance-range-of-Apples-AirPods

Normal BT device dies out after a max range of 30 feet. AirPods uses W1 chip along with the Bluetooth v4.0 The other big thing with the AirPods is the new H1 chip that replaces the W1 chip of the first model. Apple says the H1 chip has been specif...

community.fitbit.com/t5/Charge-2/Distance-from-Fitbit-to-Phone/td-p/1820406

This is the old Bluetooth standards, BT 4.x is rated a lot further at 70 feet and bluetooth 5.0 is over 100 feet. My phone is inside a metal structure and I'm across and down the street away and can still receive notifications.

services.fossilgroup.com/hc/en-us/articles/115004354146-How-far-away-can-my...

The range of the wireless Bluetooth connection between your phone and your smartwatch can vary greatly depending on the environment. In general, you should have at least 10 meters (or 30 feet) of connectivity. Your smartwatch can also use your home Wi-Fi network for connectivity in any areas covered by your home network.