Flexible, Exceptional, Beautifully Designed – The last doorbell you’ll ever buy. Revolutionary Design with Rich Sound – The stylish design of the Doorbell benefits from digitally enhanced, crystal clear sound that can be heard around your home and garden. Up to 5 Years Battery life.Introducing the Halo Light - The Innovative Halo Light and LED Strobe provide discreet but effective visual alerts which compliment your chosen melody in loud environments, or help to alert you when the doorbell can't be heard. The Halo Light includes 7 selectable colours.Never miss a visitor or delivery – Using Honeywell ActivLink™ technology, the Doorbells provide a reliable wireless range of up to 200m, with a maximum volume of 90dB, which can be heard from up to 100m away. With the built-in range extender, link two Doorbells together to boost your range up to 400m.Peace of Mind – Thanks to an LED confidence light on the push button. The Doorbell incorporates a Secret Knock function which plays a different melody and coloured light, letting you know friends or family members are at your door.Disturbance Free – Not only can you adjust the volume, the Doorbell can enter a sleep/mute mode, which mutes the doorbell indefinitely or for a period of time (3, 6, 9 or 12 hours) allowing you to relax during sleep times or evenings in with the family. Honeywell ActivLink™ is an innovative wireless protocol using the 868MHz frequency to provide greater range, extended doorbell battery life of up to 5 years and improved connection reliability.