I've been meaning to get one of those. But wouldn't turn the TVs back on if you held it up too long?
You press the button once and it takes about 60 seconds to cycle through all the on/off codes one time. It's possible they could turn back on if they responded to more than one code. But I put it away as soon as the noise stopped.
About Wal-Mart and Best Buy uniforms - I wouldn't want an actual Wal-Mart or Best Buy vest/shirt. Because then they could say I'm being an impostor and throw me out of the store. But if I just happen to be wearing the same color of shirt or vest as them and I just happen to have a lot of buttons all over the front of my blue vest, they can't really say anything about that.
I've gone into Wal-Mart in the past, wearing various work uniforms and customers would stop me and ask me questions, even though my uniform was the wrong color and my name tag was for a completely different company. So I'm sure it'll work, especially during the chaos of Black Friday. I've still got lots of my old name tags, so I'm just going to put one of those on even though I have a real Wal-Mart badge with my name on it.
Also, I read that Black Friday isn't the biggest shopping day of the year. According to some blog, it's actually the Saturday before Christmas day. So maybe I'll have time to try it out then.