Sheds, Garages, Caravans The Yale shed & garage alarm is standalone wire free and battery operated, making it simple to install without the need to run cables. A great wireless security solution for sheds, garages and caravans. Wall Mount or Freestanding The 100d B alarm will sound if motion has been detected and the correct 4 digit PIN code has not been entered within 10 seconds of entering. Runs on 4x AA batteries (not included) and a low battery light will warn when batteries are running low.