<p><b>📢  HOW To PAIR MORE TRANSMITTERS:</b></p><p>  1. Press receiver "Signal" button until LED light turns on</p><p>  2. Press red call button once to pair with receiver(be sure to remove plastic battery protector tab by opening the call button with included screwdriver)</p><p>  3. Red light will flash to confirm successful pairing</p><p>  4. Receiver will automatically exit pairing mode</p><p>  5. System is ready to use. Repeat process if call button and receiver lose connection</p><p><b>📢 FEATURES:</b></p><p> ● Waterproof & Dustproof: IP55 Waterproof Call Button/Tranmitter</p><p> ● 5 Levels of volume from 0dB to 110dB</p><p> ● Battery in Button Transmitter: 1* 12V 23A Alkaline Battery</p><p> ●  Battery in Portable Pager: 3* AAA Battery</p><p> ● Low Battery Indication:</p><p>   1. If no operation but the LED light indicator of receiver or transmitter keeps flash, or receiver makes abnormal sound, all that means low battery, please replace batteries;</p><p>    2. The paring between transmitter and receiver may lose contact after replace battery, items is not defective, just pair them manually to fix. If any usage problem, please contact us freely!</p>