Help With fire alarms

Hello I got a couple of fire alarms I narrowed down to that I want to pick out on Friday when I order Friday. I found these guys on eBay for cheap I’m very interested in the white or red simplex if I go with the simplex should I get the red version or white. Otherwise I’m thinking the Wheelock version thanks for the help and information this is my first alarm I will be buying also how would I go with mounting on the wall I don’t wanna tear open my wall for an electrical box or junction box thank uou

1: I recommend red but whatever floats your boat.

2: Buy a wooden board at Ace/Home Depot/ Lowes and mount your boxes on it.

If you get the Simplex alarm, definitely get the red one. Red alarms just look better.