What are microcomputers with built-in radio transceiver?

Question

Electronics

What are (if I exist) single-board computers that:

• They have a built-in radio transceiver (the standard is not important, the range is from 3 meters)
  
• Have a small size (up to about 60x60x15 mm)
  

It is desirable that:

• There was a corps
  
• Has a battery holder
  
• There were built-in indicators and / or buttons
  

Purpose: to be an active radio tag that acts as a key.

Answer 1

From Arduino-like ones:
devicter.ru/goods/Sensor-Node-V2
bleduino.cc
www.dfrobot.com/index.php?route=product/product&fi...
digistump.com/products/50
www.flutterwireless.com
imall .iteadstudio.com/development-platform/arduino...
imall.iteadstudio.com/development-platform/arduino...
moderndevice.com/product/jeelink-module-assembled
www.anarduino.com/mini
https://pinocc .io/
www.rfduino.com/product/rfd22301-rfduino-ble-smt/i...
shop.ciseco.co.uk/xinorf-100-arduino-uno-r3-based-...
sandboxelectronics.com/ ?product=airduino-wireless-...
rayshobby.net/rftoy
https://www.tindie.com/products/femtoduino/imuduin...
https://www.kickstarter.com/projects/1155352945/su...

Answer 2

The first thing that comes to mind is Virt2real .
And if you look wider, you can look for any dev kits from Broadcom. They often have some kind of transmitter on the crystal besides ARM.