Roule&reg; RL-2R3921N Energy Saving Wireless Remote Doorbell, Ip44 Waterproof and Dustproof Standards, 8 Chimes. Wireless range up to 600 feet, low energy consumption, 3 AAA batteries for receiver last 3 years. 8 different chimes, sound volume control available. Remote control meets IP44 waterproof and dustproof standards. Advanced learning code technology and digital transmission signal to prevent interference. Easy setup, no cable or wire required, all mounting kits are included.