According to the Bluetooth-standard the range is up to 10 meters. The optimal range for BLUETOOTH STEREO DEVICES OF ANY BRAND is between 0,5-1 meter from the music device (etc. your phone) to your headphones. This will help in avoiding signal drop outs. Please note the quality of the Bluetooth signal may also be influenced/weakened by obstacles like walls, furniture, thick clothing/textile, phone covers, or metal.