Mini Wireless Doorbell, Remote Door Bell Ringer Wireless Long Range 650FT, Coolqiya Portable Wireless Door Bells with 1pcs Waterproof Button and 1pcs USB Chime (1 USB Receiver+ 1 Transmitter)

The latest doorbell design- The unique design with USB chime, that looks small and portable; the compact size of the USB plug-in receiver, it won't block other sockets, save spaces.
Wireless Distance Transmission- Operates at the highest distance up to 198m in the open air. Strong Working Signal doorbell for most material door or walls, including glass, metal, and wood; you can expand 25+ doorbells (receivers) & remote door buttons (transmitters).
11 Ringtones and 5 levels Volume to Adjust- Adjust a volume range of 0-110dB. It remembers your previous melody and volume level - even after a power outage.
IP55 Waterproof & Easy to Install- Transmitter buttons are water resistant and for outdoor use. 1. USB powered chime, can be powered by USB adapter, PC, power bank, etc. no batteries required, 2. Mount the remote door button (battery powered) by sticky pad or anchors & screws.
EASY mode- All the transmitters from us can activate the USB Chime without any setting, and the ringtone are the same for all transmitters.
CUSTOM mode- each transmitter should be paired to the USB Chime and the ringtone can be set different.
After-Sale Service- Friendly customer service in 24hrs to make sure your satisfaction, any question please feel free to contact us, we will serve you sincerely.
NOTE: Before Installation- Take the transmitter bracket apart and Take off the insulating.