Drink bottles, or containers, with bite-actuated mouthpieces. The stem includes a proximal body portion, a sealing portion, and a shoulder portion. A bill hopper provided in the depositwithdrawal port is provided with a movable structure and is disposed in a position suitable for discharging bills in the slot. The handover decisions of the UE to the neighboring cell are then controlled based on the determined mobility threshold. The flared portion is constructed by an upper surface forming a recess, a side surface adjacent to the upper surface and curved, and a lower surface connecting to the base portion. Thereafter, the variance of the converted DCT coefficients is obtained, and then an average quantization error for each set of said DCT coefficients is determined based on the variance, the quantization matrix, and the quantizer scale.