1、Elderly Doorbell and Pager: This smart doorbell is specially designed for the elderly to use, easy to operate, very loud music, safe and reliable for old people to use. 2、Long Distance Transmission: The signal transmission distance between the transmitter and the receiver is far, which meets the needs of most families. 3、Loud Sound Quality: The doorbell built in hi fi speakers and noise cancellation technology, the sound is loud, easy for the elderly to clearly hear the voice of the visitor. 4、Efficient Solar Charging: The doorbell is solar powered, without battery replacement, and can be used for a long time. Save energy and reduce environmental impact. 5、52 Music Options: The doorbell built in 52 beautiful music, adjustment is simple, you can adjust according to their own preferences, but also adjust the volume. Item Type: Doorbell Material: ABS Transmitter: Battery Type: Lithium battery, Battery Capacity: 150mAh Receiver: Working Current: ≤60mA, static Current: ≤10mA Power: ≤2W Music: 52 songs Operating Frequency: 433MHz Adjustable Volume: 20-80dB(4 level cycle adjustment) 1 x Receiver 1 x Transmitter 1 x Base 1 x Double Sided Tape 2 x Screw 2 x Expansion Bolt 1 x Multilingual Manual