Don't waste your money. While the telephoto lense is acceptable, most everything else about this instrument is lousy. The focusing system requires three adjustments to get it right, and then the result is iffy. The two AA batteries are sorely inadequate for all that's required of them, and if you can get 20 minutes use out of a fresh set, you're doing good. The On/Off switch sometimes worked, sometimes did'nt. Overall this seemed like an experimental model, needing many improvements. I used mine for a week and sent it back, very disappointed.
Cons: Batteries die in 15 minutes. focusing is cumbersome. On/Off switch works intermittently.
This review was written in the old system and had content requirements that are different than reviews written today.