Smoke detector with sealed lithium battery, battery life 10 years. With its stylish variety of shapes and colours, the extensive Delta product range offers you a wealth of individual design options that skilfully underline the aesthetics of any room. Delta electronic devices for installation technology offer extensive additional functions such as dimmers for all common loads including LED lighting, motion detectors in surface-mounted and flush-mounted versions, blind controls, timers or room temperature controls. DELTA switches and sockets - design and quality in perfection from Siemens.