AVANTEK DT41 radio Portable doorbell kit, 36 ringtones, 300m range [1 doorbell transmitter & 1 plug-in door chime receiver], Black (Kitchen)
I've been using for years a wireless doorbell because I find it convenient, also in the basement, the first floor, in short, everywhere to take then the receiver where you are staying. However, my model had a receiver, which was powered by batteries.