Just had a new battery in the T350. Approx 40 secs after setting it bleeps 5 times. Then again when unsetting. Any ideas why and if it's indicating a problem?
I think when reconnecting the battery, you should press the disarm button on the remote to deactivate the beeps. I missed when doing this and got the same as you. Don't worry, it will go after c. 10-12 arm / disarms.