The Alecto ADB30ZT is a wireless kinetic doorbell that operates using kinetic energy, without the need for electrical wires or batteries. When you press the button, energy is generated, making the doorbell completely environmentally friendly. Installation is very simple, as you only need to attach the doorbell to your front door using the included mounting materials. The doorbell is splash-proof (IP44). The indoor chime is wirelessly connected to the doorbell and can be hung anywhere in the house. Do you have areas in your home where the doorbell is hard to hear? You can expand the Alecto ADB30ZT with up to 6 indoor chimes and place them in various locations throughout the house. The doorbell has an effective range of up to 50 meters, allowing you to install it in the attic or basement as long as it is within this range. In open fields, without obstacles like walls or devices, the range can extend up to 200 meters. To prevent interference, the Alecto ADB30ZT operates with a coded signal. It is also important that you hear a pleasant ringtone when someone rings the bell. Therefore, you can choose from 36 melodies. Additionally, the volume of the white doorbell can be adjusted to five different levels (ranging from 0 dB to 110 dB). This way, you can hear the doorbell loud and clear anywhere in the house. Package includes: wireless kinetic doorbell, receiver, double-sided tape, manual.