If you are asking about what depreciation class to use, choose 7-year (same as office furniture and equipment) since there is not a specific class life designation that matches.
Or, you can use the de minimis safe harbor and write off the cost as a miscellaneous expense or repair if it qualifies. Take a look at the information below provided by TurboTax Coleen for more details about this option.
https://ttlc.intuit.com/replies/6149380