The manual is [https://www.1800doorbell.com/wp-content/uploads/pdf/LRA-D1000_DCRX+PBTX.pdf new doorbell] It has a wallwart power supply and 3 C cells for power. The door buttons use cr2 battery | The manual is [https://www.1800doorbell.com/wp-content/uploads/pdf/LRA-D1000_DCRX+PBTX.pdf new doorbell] It has a wallwart power supply and 3 C cells for power. The door buttons use cr2 battery |