If you really have a Roku 1, model 2710, this is a 3rd generation Roku, released in 2013. It uses a direct-line-of-sight infrared (IR) remote. The actual Roku remote for this would be their "Simple Remote", available from Roku's accessories page, or other retailers like Amazon, Best Buy, Wal-Mart, etc.
All Roku devices respond to the same set of IR commands, so any inexpensive universal remote that says it can control Roku devices should work with it.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X