: Brand Name : RuiLing Inside : PCB board and IC parts are appointed with robust corporate, keeping elongate lifetime ; Adopt whole number coding it is more permanent and can avoid interference ; Practical : Easy installation, expedient, Plug and play ; with double-side stickers at the plump for of the far button, also you can use screw to fix it. -LRB- Including -RRB-. Customer : Please note that we supply two options for installing the doorbell button, with 1 -RRB- double-sided tape or 2 -RRB- screws and anchors. Using the backup man tape is a jury-rigged solution. We the screws and anchors. the soft installation instructions. Technical : Frequency : 315 MHz ± 0.5 MHz / 433 MHz ± 0.5 MHz brisk pressure wave -LRB- receiver -RRB- : = -57 dbm disinclined pressure wave -LRB- transmitter -RRB- : = -36 dbm Power supply -LRB- receiver -RRB- : AC 110V Power supply -LRB- transmitter -RRB- : 1X12V 23A -LRB- ALKALINE BATTERY -RRB- running power consumption : = 5W Transmit power : Operating range : 280 METERS -LRB- OPEN AREA -RRB- complete options : 36 chimes ,32 alphabetic character melodies * Plug-in, wire detached, USA plug on hand * FCC, CE and RoHS manageable * Transmitter/bell push IP44 cloth * 1 million sets of auto-learning codes to avoid interference * Energy saving, transmitter battery can be used for over 15 months, and plug-in receiver working power consumption less than 5W * 4 Levels adaptable Music volume. Package : 1 x Push Button -LRB- Transmitter -RRB- 2 x Plugin Chime -LRB- Receiver -RRB- 1x backup man sided sticker 2x Anchors and screws 1x Screw tool 1x 12V 23A battery .