Be careful with the kami doorbell promo. They can't fix the issues 1)long 20 minutes cool down, videos not recorded (ex. mishandled amazon delivery not recorded) they can't give concrete answers,2)hardwired from existing mechanical doorbell but still needs to charge the battery (what's the point of connecting hardwired?),3)battery life too short, hassle to keep charging even though it's hardwired connected.4)Offered with extended cloud service but can't even fix the issues. 5)no refund. Trapped!