Yes they are ok
But following up on what enter is saying , narrow views like alley ways have there problems and it's not about the resolution , it will be how the ir spreads so lens and corridor view can help if you know what your doing ,
Yes Pete I know it's not what you meant , but your sacked anyway
All employees are allowed to "volunteer " for there company tho asking as they are not directly making money for them , so maintenance is allowed as an example volunteered
Won't work well for nationals but smaller companies like you lot will work something out I am sure
Seriously tho, these are a proper pain , all the risco stuff is on resetting tampers , annoying
But you sure all batteries are good ? And you closed them correctly ?
Last one I found was a sensor the customer didn't know they had (smoke alarm)