It’s not perfect but I do like having maps when I drive. I wish someone would come up with a single DIN that is full glass (no trim) and have power and volume buttons. Hope yours works out well. It’s not bad at all for the price!

I haven’t found a way yet… it is a little annoying but for the price I can’t complain.

Yes, there are two power wires, one supplies constant power even when the ignition key is removed and is usually the radio's yellow wire, and one is for accessory power which is usually a red wire on the radio. The constant power lead keeps the radio in a sleep mode and the accessory lead wakes the radio up. Depending on the unit, when wired properly the boot up time is only a few seconds. The standby power drain is extremely low so there is no danger of draining you car battery unless you let your car sit for weeks without charging the battery. Even then some radios have a low power drain prevention circuit which completely shuts down the radio if the car's battery voltage goes below a certain level.