【Up to 150m Working Range】 A strong and penetrating signal helps you never miss a visitor's arrival, even if you are in other rooms or other floors of your house. 【IP44 Waterproof and Dustproof】 IP44 waterproof and dustproof; this doorbell works in temperatures ranging from -4℉/-20℃ to 140℉/60℃ and supports various bad conditions. An ideal choice for your home. 【3 Working Modes】 Three modes to satisfy your different needs. First, Ring and light mode; second, only Ring; third, silent mode (only light). 【38 ringtones and 4 adjustable volumes】 It has 4 adjustable volume levels, the maximum intensity is 120 dB and the minimum is 0 dB (mute), which can be adjusted at any time according to the situation. There are 38 different ringtones to choose from, including a variety of classic ringtones. Provides you with rich and clear sound. 【Innovative Memory Function】 Without the need to reset the previous settings after a power outage, it will remember your last selection. Product Description