It is the "Hybrid System Warning light"
Could be because you let the batteries go flat. I would suggest getting a code reader or having toyota look at it as it may be one battery has died or at the very least it needs the error codes clearning.
There are a few choices, but most of all I would seek out a recommended installer. However if you want to DIY the job them head over to the Alphard market group on facebook and they can convert the exsisting unit to android or apple play for you.