The right range is where the signal remains strong, even if you move away from the source. Most of the headphones have their signal strength indicated on the packets. Some will have a range of 30 feet. The most powerful ones will have a signal range of 300 feet.  Either way, you must select the right headphone that will meet your needs. If you like moving around from room to room or within your compound, select the most appropriate option. The 30 feet option will be ideal for use while you are within your house. You can use the 300 feet alternative if you are operating in the field.