Renogy BT-1 Bluetooth Module for solar charge controller

Bought this a year ago and then barely used it. Bluetooth module for compatible charge controllers such as Renogy Li 20A MPPT. Please make sure this is the correct module for your controller. The Renogy BT-1 uses an RJ12 connector while the BT-2 has RS485. (Note: I'm also offering this as part of a bundle with a Rover Li 20A MPPT charge controller.)