①. Convenient installation, good doorbell, no damage to the wall, double-sided adhesive tape, one touch, one tear, one buckle, can complete the installation, stable and firm, no damage to the wall, can also support the installation with screws. Transmitter with 2 Receivers. ②. Household loud volume, 7 colors of bright light reminder, long-distance wireless flashing doorbell, suitable for families, can also call with one button to protect their families. ③. Low power consumption, environmental protection and energy-saving design, low power consumption, only 7 AA batteries, 3 batteries for each of two receivers, and 1 battery for each transmitter. It can be used for 3-5 months, without potential safety hazards, no fever, safety and confidence, and is suitable for various environments, and it will not affect the use in rainstorm and typhoon days. ④. The transmitter and receiver are connected wirelessly, and the wireless signal is transmitted. When the button is pressed, the receiver emits beautiful music and flashes seven colors of lights at the same time, which is very convenient for hearing and vision at night. ⑤. Ring the doorbell, the volume is not missed, the volume of level 4 is adjustable, and you can hear it within 150 square meters. No matter how big the house is, you will not be afraid, and you will not let go of every friend who visits your home.