Abstract: A pool alarm device for detecting when a person enters a pool. The pool alarm device includes a detector means for detecting motion. A saddle for holding the detector means removably receives the detector means. A fastening means removably fastens the saddle to the wall of the pool. A transmitter for transmitting a signal is operationally coupled to the detector means. The transmitter transmits a radio signal when the detector means detects motion. A housing holds a control means. A receiver receives a signal transmitted by the transmitter. The receiver is mounted in the housing and is operationally coupled to the control means. A speaker for producing an audible sound is operationally coupled to the control means. The speaker is mounted in the housing. The control means sends an audio signal to the speaker when the receiver receives a transmitted signal.