GE Battery 3.6V 700mAh replacement for BT-1006 BT-800 BT-904 36154 | eBay
HQRP 120V-240V to 24V 40VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Doorbell Power Supply Adapter Door-Bell 120v-240v-to-24v, UL - Walmart.com