1.High Quality: Our wireless doorbell is made of ABS material, which is non-toxic, harmless and recyclable, the material can keep itself against from dust, rain and high temperature. It has no electromagnetic radiation, so its perfectly safe for pregnant women. The levels of protection of remote transmitter button is rated IP44 waterproof, it works perfectly outdoors.2.Radio Operating Range: The doorbell receiver is highly sensitive, 1 transmitter button triggers 1 chime units and the radio waves is covered all over the house and wont interfere each other, the range of action is up to 300ft in the open area ensures you can hear the bell and answer the door or sign for the package in time.3.38 Different Tunes & 5 Volume Levels: Our wireless doorbell is provided with 38 different ringtones with 3 levels adjustable volume from 20db- 80db. You can enjoy the tone music and set your favorite tones as you wish.4.Energy Saving & Long Life: Ultra-low power consumption design, Sustainable Use of Energy. The transmitter battery can be used for over 15 months. Our wireless doorbell material is very durable, it can bear over 100 thousand times click.