Bell and Howell Multi 6 Pack Ultrasonic Pest Repeller Complete Home Kit

what is life expectency of ultrasonic pest repeller?

How long do they last? I've had mine for approximately 5 years. Worked great, but cat brought me a mouse last night.

How many square feet does it cover cuz only other ones on the internet I see that cover up to 13 square feet is 16 square feet?

I have birds and chickens? Will it bother them?