They're 60 euro, which is different from $60, and are 61 key, not TKL. That said they are RGB, and do support bluetooth, so fair play. I wasn't aware that companies did RGB+BT. It's running the power budget way too tight from an engineering point of view.
I would expect battery life to be quite short though when on battery with the LEDs on. Especially if you're using them at high brightness.