LilyTiny Board ATTiny85 5V - Arduino Compatible

Like the Digispark, the LilyTiny has an ATTiny85 with bootloader on board so that you can program via USB.
This lilypad will have enough storage to be able to run relatively simple programs.
The pins are listed on the board. The board can be powered with 7-12V (on VIN pin) or directly on the 5V pin.

Dimensions: 25mm (diameter) x 4.3mm (height)

This product can be used as Digispark board and you can use the following tutorial for this: Connecting and Programming Your Digispark