While the range of Bluetooth is 10 meters, the recommended optimal range for any Bluetooth stereo device is half a meter in direct line to your music device, particularly outdoors when the signal cannot bounce off walls and ceilings. This rule applies to any brand of Bluetooth stereo devices. In MIIEGO headphones, the antenna is located in the right-side earpiece. So please make sure your device is on the right side of the body for optimal connectivity while outdoors! This will help avoid signal dropouts. Please also be aware that antennas on iPhones are located in the bottom of the phone.