Abstract: The swimming pool safety device comprises a circuit board, one or more motion sensors, a wireless transceiver, a cover, and one or more batteries. The swimming pool safety device may monitor a swimming pool for motion. In the event that motion is detected, the swimming pool safety device may transmit an alert message to a remote monitoring point to warn of a potential drowning. As non-limiting examples, the remote monitoring point may be a smart device, a home security system, or both. In some embodiments, the swimming pool safety device may comprise a temperature sensor and may be able to transmit the temperature of the water to the remoting monitoring point. The swimming pool safety device may be left free-floating in the water or may be coupled to the pool using a wall attachment.