Amazon has the Homasy Waterproof Wireless Doorbell Kit in $9.99 with FREE shipping for Amazon Prime or orders over $25.
- Wireless Range up to 600 feet in open space.
- 50 Chime Options.
- IP44 Waterproof.
- 4-Levels of adjustable volume from 25db-110db.
- Easy Installation.
- 12-Month Warranty and 60-Days Money Back Guarantee.