45 Music, 4 Volume Levels: Change the ringtone with just one press of a button, this wireless doorbell has 45 melodious ringtones from around the world. It is also equipped with seven flash colors, the product has four adjustable volume levels (including silent mode), the flash will always be on in silent mode to meet your different needs. 200 Meters Long Distance Coverage: The doorbell has good wall-penetrating signal capabilities, and the wireless signal can be transmitted to an ultra-long distance of 400 meters (open areas). The signal can completely cover your home and will not be. easily disturbed by other devices. With memory function: This wireless doorbell will automatically remember the volume and ringtone you choose, and it will automatically start after unplugging it and turning it on or off, no need to reset it according to your preferences after restarting. Waterproof and dustproof: With IP44 waterproof and dustproof function, the wireless doorbell can also be used