Beeping is p****ng me off

On locking the car it beeps twice unlocking 1 beep searched everywhere for solution. Checked bonnet switch and tested ok

Any help much appreciated
 
I had this for a while and after replacing the batteries in my key it stopped. Not sure if it some kind of warning that the signal is too weak or the keys are not present? Someone else might have a better solution but £4 for a new battery won't break the bank, especially if it works.
 
I have done this but still happening. Could a poor car battery cause this. Still running the original battery on 06 plate