Alarms can be visual, audio or both. WARNING This product contains a coin or button battery. A coin or button battery can cause serious internal chemical burns if swallowed. Batteries 4 x AA batteries, not included and 3 x LR44 button cell batteries, included. Includes: 3 x Lr44 Button Cell Batteries,. Features clear, three coloured lighted display and simple-to-program alarms (1 second to 24 hours) plus it adheres to any magnetic surface! Measures 17.5 H x 12.5 W x 4cm D.