Feature 1Main Application: The alarm system is applicable to patients, elderly people, pregnant women, children calling for help at home. There is no need to shout to get attention. 2Powerful Function: The signal can be received within 330 meters of the open space, and the signal can pass through the wall. 3IP55 Waterproof: This call button is IP55 waterproof and can be installed in the washroom, very practical! 4Music, Volume Adjustable: There are 38 songs, and 4 level volume adjustable, you can make adjustments as needed. 5Easy Carrying: Comes with small size and lightweight, you can easily take this button with you to help with your daily life.Specification: Item Type: Alert System Material : ABSWireless Receviing Distance:330m/1082.7ft (Open Area)Wireless Frequency: 433MHZMethod: 1 to 1Built in Battery of Remote Control: 1x23A, 60mAh Alkaline BatteryVoltage: 100-240V ---------- .wang-edit-text{ ------------ font-family:'Arial' !important; ---------- } ---------- .wang-edit-text table { ------------ border-top: 1px solid #000; ------------ border-left: 1px solid #000; ---------- } ---------- .wang-edit-text table td, ---------- .wang-edit-text table th { ------------ border-bottom: 1px solid #000; ------------ border-right: 1px solid #000; ------------ padding: 3px 5px; ---------- } ---------- .wang-edit-text table th { ------------ text-align: center; -------- }Package List:1xAlert System1xButton1xManual