As stated in the description and specified by other buyers, it is indeed the HR-3UTGB reference for AA and HR-4UTGB for AAA.
"Nickel-metal hydride battery low self-discharge", manufactured by Sanyo Eneloop third generation.
For the rest, no surprise, it is very good batteries, conforming to their reputation.
A precision that can be interesting for some future users: the size of the batteries is correct. No worries of microns too that could block too tight or narrow housing access.
To reload, I recommend a slow charger (200 mA), which will extend even more their efficiency and lifespan. Personally, I use the Technoline BC-700 (also purchased from Amazon) that has a current adjustment and other useful functions.