Codream Wireless Doorbell Portable Smart Home Digital Door Chime Operating at 1000ft/300m Range with 36 Chimes and 4-level Volume Battery Included Wireless Operation Range: Up to 1000ft/300 meters range in open spaces. Make sure that you can hear the doorbell sound in a large warehouse. 36 Door Chimes& 4 Volume Settings: The left side of the receiver wireless doorbell button with 36 different tones to choose from your favorite.. Elegant Style & Easy Installation: Fashion and elegant design doorbell chime used for home decoration is good choice. Easy to install through double-sided adhesive tape without drilling hole in the wall. Sound &Visual extended device:ring doorbell of the wireless doorbell receiver can be seen as an alarm. A good caregiver alarm for someone bedridden to summon someone in the house alarm. Blue circle LED indictor of the wireless doorbell receiver can be considered a signal. A good signal hearing aid helps for the hearing impaired to overcome defects in hearing. Good Gift Choice: New design and nice appearance make it is suitable as a housewarming and smart home decoration gift to your friend.