Can I write off the case/screen protector for my phone?

[RossonServices]

I'm unsure why I never thought of this. I have a phone I use specifically for my small business. It's is separate from personal. I keep it in a case with a screen protector - can I write those items off? I probably wouldn't write off a charger or something like that, but I can easily prove a case/screen protector. 

[Bsch4477]

If you report your income on Sch C you can deduct that expense there.