18v doorbell transformer, lanmu power adapter compatible with nest doorbell, nest hello video doorbell, simplisafe and blink video doorbell (16.4ft/5m) (black) lanmu <b>parameter:</b></br> input: ac120v;60hz</br> output: ac18v;500ma</br> length: 197inch (500cm)</br></br> <b>compatible:</b></br> nest hello video doorbell</br>arlo video doorbell</br>eufy video doorbell>/br>simplisafe video doorbell</br></br> <b>warranty:</b></br> 2 years</br></br> <b>package includes:</b></br> 1 x power aadpter</br></br> <b>note:every video doorbell may take a few minutes to power on after wiring the power adapter,especially for the first time use,please try to charge your video doorbell longer before use.</b>