US Patent 10062259 Pool floatation device with sonar

A pool floatation device including a body configured to float on the surface of water of a pool. A sonar device may be coupled to the body and configured to detect movement of an object beneath the surface of the water of the pool. A wireless communication device may be coupled to the body and configured to transmit a wireless signal for indicating to a terminal device that the sonar device has detected movement of the object beneath the surface of the water of the pool.