24vac hvac thermostat with battery backup

{"cid":"91148828","title":"White ABS 24VAC \/ Battery Operated HVAC Thermostat","imgUrl":"https:\/\/img.ismap.com\/nimg\/f0\/a9\/02ec0674baf3ea50f54cb8051951-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"OEM","Model Number":"731W","Minimum Order Quantity":"1 piece","Delivery Time":"7-45 work days","Certification":"CE, RoHS","Place of Origin":"Guangdong, China","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram","Supply Ability":"50000 pcs\/month","Packaging Details":"1 piece in a gift box","Backlight":"White\/Blue\/Green\/Yellow","Accuracy":"\u00b11\u00b0C (at 20\u00b0C)","Theory":"Temperature controller","Material":"ABS+PC","Color":"White\/Customized","Relay":"Omron","Feature":"Energy-saving","Display":"LCD Screen"}}