Bladder Scanner is a 3D ultrasound medical device to measure quickly and accurately the bladder volume and post void residual volume. * Quickly,accurately,and noninvasively measures bladder volume. * Helps assess urinary retention and postoperative urinary retention. * Helps prevent unnecessary catheterization. * Helps reduce rates of catheter-associated urinary tract infection. * Helps improve efficiency,reduce costs,and save staff time. * Easy to use-no sonographer required. * Working time with Li-battery about 5 hours.