Parent unit for HB6240 baby monitor system, not compatible with HB40TX. 

What's in the box:

Parent Unit *1

User Manual *1

Charger *1

Quick and easy setup—pairs instantly with your camera. 

Product Upgrades and compatibility：To ensure that we send you the correct monitor for your existing camera, we will need to verify the version and model.

How to Confirm Compatibility: Once your order is placed, we will send a product confirmation email requesting the following information:

1.The Amazon order ID for your original purchase of the monitor, or gifted date.

2.The Serial Number (S/N) located on the back of your monitor.

This information is required to confirm compatibility and ensure that the right version is sent to you.