Most key fobs have a range of about 100 feet, give or take. That said, there are a few things that can affect the range of your key fob, including:
-The type of key fob you have: Some key fobs use radio frequencies while others use infrared (IR) signals. Radio frequencies have a longer range than IR signals, so if you have a RF key fob, it will likely have a longer range than an IR key fob.
-The condition of your battery: A fresh battery will usually provide better performance than an old or dying one. If your key fob's range has been gradually declining, it might be time to replace the battery.
-Interference from other electronic devices: If you live in an area with lots of electronic interference (like near a power plant or airport), that interference can play havoc with your key fob's signal and reduce its effective range.