Linbell

Wireless doorbell are common nowadays but what make Linnell different is because it does not make use of battery. It is very easy to install. This product is made up of 36 ring tones that you can easily select the one you like and it also has adjustable volume.

Linbell is entirely self-sufficient, converting the kinetic energy of the switch actuation into a voltage pulse, powering an RF transmitter and sending signals to the receiver.There are 2 transmitters, 1 receiver, and 1 Evaluation board in the kit.The transmitter contains a energy harvester and a wireless PCB. When you press the transmitter, it will transmit wireless signal and the receiver will receive the signal and output digital "1" or RS232 digital message.

The evaluation board contains a connection unit for RS232 to USB, one reset key, and one buzzer. You can see the communication message by a serial digital numbers on the computer.
It is sold at $22,081