The present disclosure relates to 5,6,7,8-tetrahydro-6-N,N-bis(2-thienypethylamino-1-naphthol, a method for preparing the same, and use of 5,6,7,8-tetrahydro-6-N,N-bis(2-thienypethylamino-1-naphthol as a reference compound for determining an impurity in rotigotine or a preparation thereof. The dispenser can also be colored red on its top section and white on its bottom section to resemble a fishing bobber. A received uplink signal quality calculating unit calculates received signal information on the each mobile station based on the pilot signal of the each mobile station. A wall to prevent the coupling member 50 from lateral displacement is provided at the notch 30, said wall being contacted with a side part of the coupling member 50. The device for warming the supply gas is configured so that first warms a humidifier at an outlet side of the supply gas, and then warms a humidifier at an inlet side of the supply gas. Methods of making and using the apparatus are also disclosed.