Sensky PML0A1 Wireless Doorbell Operating at 1000-feet Range with 36 Chimes Tones 4-Levels Volume, 1 Push Button(DC Transmitter) and 1 Door Chime(AC Receiver) Wireless doorbell kit of 1 push button(transmitter) and 1 door chimes unit(receiver) Supports a wireless transmit range up to 1000-feet in open area, Signal transmission unblocked. 36 Chimes Tones, Four levels of adjustable volume from 25db to 80db and You'll never get bored with over 36 varied style of tunes for optional. Low-power consumption design,power saved and durable. Adopt excellent inner materials that keeps itself from getting higher temperature & interference and keeps stable transmitting range. Easy installation,convenient,plug and play;with super double-side stickers at the back of the remote button(Do not need to drill hole in the wall).Easy to DIY.