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Package Included: 1*doorbell, 1*button/2*doorbell, 1*button/1*doorbell, 2*button/ Specifications: Remote control You can control the doobell at anywhere and time as long as your smartphone has network Differentiate and set ringtones Different ringtones can be set for different buttons to easily distinguish front and rear doors The ringtone of each button can be adjusted individually ,0-100% volume adiustment Each button supports individual renaming Record by bell , push message you can View the bell record by day Support to push the bell message to the mobile phone ,display the name of the button on the APP , and easily knowthe visitor situation Description: Technical parameters 1 . USPLUG . UK PLUG . UE PLUG 2 . Operating voltage : AC 220V 50HZ / 110V 60HZ 3 . Power consumption : 0 . 5W 4 . Wireless frequency : 433 MHZ 5 . Operating temperature : -10 ~+ 45摄氏度 6 . Ringtone volume : 25-85db 7 . Wireless distance : 150 meters ( open space 8 . Receiver size : L101 *W67*H50-70MM 9 . Transmitter : CR2032 3V 10 : Transmitted power : < 10mw 11 . Transmitter size : L70 X W41 X H16MM