Any of the following Logitech Keyboards with their "Easy-Switch" technology will allow you to switch between multiple devices via Bluetooth. They have three buttons or a 3-way dial to switch instantly between up to three devices.
I personally use the tenkeyless (TKL) Logitech K480 at work since it can switch between 3 devices and has a tray for my cell ...
I was thinking of a USB mouse with a cable that plugs into a USB port, not a wireless mouse with an RF dongle. If I were to use such a mouse, I'd turn Bluetooth off. The question is would a cable-connected USB mouse that got its power via the USB port drain the battery less than a Bluetooth mouse. Thanks.
Each A2DP "service" is Mono-Directional.
A typical device using the A2DP profile for music will not support more than one service (i.e. audio stream), but it's possible. This would need a more complicated chipset so it may not be suitable for the size constraints of "truly wireless" earbuds.
Unfortunately I can't recommend any headphones ...
You could get something like this USB Switch and attach a USB Bluetooth adaptor to it.
It allows you to connect up to 4 USB devices and then it can connect to up to 2 PCs / Laptop with a single USB cable. With the touch of a button you will be able to switch between PCs / Laptop.
Since very few cellphones nowadays have external antennas, and they are not Android but are 2G only, a cellular repeater or femtocell at 20m elevation is recommended.
It must match the cellular voice and data frequency bands used by your provider, wherever you are, and may require regional regulatory approval. They will work, as adding another cellphone (...
Bluetooth itself is single master multiple slave. Which means that you cannot bind a device to multiple hosts simultaneously. You would have to reconnect/rebind your keyboard every time you want to switch the master. There is no way around it.
There aren't any buttons that can unlock an iPhone to the best of my knowledge because it would be a security risk. However, you can pair a bluetooth keyboard to the iPhone and use the keyboard to unlock the phone. When I pair my Logitech K480 keyboard with my iPhone, it allows me to lock/unlock, type messages, take screenshots, adjust volume, and more.
Well yes, but actually no
From a software standpoint, I personally think the polish for Bluetooth location trackers has reached a point that it can be considered mature enough for "everyday" use. I personally don't have a ton of experience with them, but from what I have done and do know, they're in a good place.
The real problem is that all of these ...
I have a ... "Terabyte 100031N Ultra Slim Wireless Mouse (Black)"
This mouse does not use Bluetooth at all. It is simply a "wireless" mouse that uses some sort of proprietary 2.4 Ghz signal to communicate with its USB dongle. That means you can not connect any Bluetooth device to the dongle for that mouse. It is unlikely that you can even use that dongle ...
Products like this seem to exist in the market - which are bluetooth enabled weighing scales.
I feel that Hexiwear is a pretty good platform, although a little expensive. I feel it ticks most of your boxes:
rubber wrist band - check
rugged and robust - not really, but it's enclosed in that wristband
small form factor - check
no builtin aps - check
loading own software - that MCU is fully programmable
sub 50$ (49$) to be exact
You might initially be ...
Most wearables have this functionality. The Charge 3 performs this function well. It will vibrate when the phone rings and show you who is calling and when you get a text. It has good range over Bluetooth. If you are willing to spend more, you can get more features from a Samsung or Apple smart watch.