Products Features:
Designed by top fashion master to meet the market;
IP44 Waterproof design;Bionic comfortable button;
4 level volume from 25db to 85db;
Excellent inner materials keep itself from getting higher temperature&interference;
Easy installation with double-side stickers or screws
Certifications:passed CE,FCC,RoHS approval;

How learning door bell works?
First please check the products and make sure they are power connected;
Press transmitter button and LED will lit if transmitter works;
There are two buttons on receiver's left side,one is 'volume' button,the other is 'music' button.Press 'volume' to test volume function,total 4 level;Press 'music' button to test function,52 tones available
Long press 'volume' for 5s until LED flashes to get entered into 'pairing' state.Call bell melodies can only be changed under 'pairing' state;
Press transmitter to make paired,receiver sounds if receiver is paired with transmitter successfully;
Press 'music' to switch required melody for different transmitters;
Press transmitter to send RF signal to make paired after required melody is chosen;
Long press 'volume' for 5s until LED stops flashing to exit 'pairing' state;
Press transmitter to have a final check about pairings works;

How to avoid signal interference?
Outter RF signal may interfere and also paired with receiver,Long press 'music' for 10s to clear receiver memory After memory is cleared,only one transmitter will stay pairing,others need re-made 'paring'
Note:please try to avoid outter interfere RF signal when pairing tansmitter with receiver