Carbon monoxide detector with sealed lithium battery. Battery life: 10 years. Our extensive DELTA product range offers a wealth of individual design options through its stylish shapes and color diversity, expertly enhancing the aesthetics of any room. DELTA electronic devices for installation technology provide a wide range of 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.