X-Sense SWS51 Link+ Pro water detector with dual sensors (top and bottom). Via the X-Sense SBS50 base station, WiFi network connection via the 2.4 GHz band is possible with a maximum of 50 X-Sense Link+ Pro wireless detectors on 1 base station. Equipped with 2 replaceable AAA batteries that have a lifespan of approximately 3 years. Push button for siren mute function and detector test. Siren sound level: 110dB. IP66 waterproof. Sensor lifespan: 5 years.