CACAZI C20 Two To Three Wireless Pager For The Elderly Home Care Waterproof Emergency Pager, EU Plug 1. Scope of application: homes, office buildings, hospitals, hotels, restaurants, factories and other places 2. Remote control is available at a straight-line distance of 80 meters on open ground 3. 4-level volume adjustment (including mute) 4. 38 pieces of music can be changed at will 5. Button waterproof design, one-click to call for help and care for your family 6. 24-hour safe companionship, early detection of emergencies, making care easier 7. The transmitter is designed with a lanyard, so you are not afraid of losing it. It is convenient to use and carry. You can get it easily when needed. 8. Doorbellcall combination: With music distinction function, the outside button and indoor pager can be configured with different music to distinguish whether guests are visiting from outside or calling for help. 9. The host can distinguish different buttons: through different button signals, the host can emit different ringtones (to facilitate the differentiation of help signals sent from different directions) 10. Call button: one 2032 button battery (not included) 11. Transmitter: one 12V23A battery (not included) 12. Receiver: AC plug-in, supports 110-240V voltage 13. Call button size: 60mmx34mmx11.5mm 14. Transmitter size: 77mmx46mmx20mm 15. Receiver size: 90mmx56mmx20mm 16. The complete set comes with 2 transmitters and 3 receivers - Installation method 1 : double-sided tape Peel off one side of the double-sided tape and stick it on the bottom of the transmitter Tear off the other side of the double-sided tape and stick it on the wall outside the door Warm reminder: After the double-sided tape is pasted on the wall, do not let go, press and hold the transmitter for 30 seconds, and then release it (it will stick to the wall more firmly) - Installation method 2 : screw fixing Use a flat-blade screwdriver to aim at the opening and pry open the bottom case. Place the pried-off bottom case against a