Bose Noise Cancelling Headphones 700 have a range of up to 10 meters (33 ft) from the source device. It is realistic to describe the range as being the room that the user is in and the adjacent room. This range may be reduced by physical obstructions, such as walls and doors, or by interference from other electronic devices. Pops or a crackling noise may be heard if there’s interference with the Bluetooth connection. If that happens, move away from wireless routers or microwaves and bring your headphones closer to the Bluetooth device.