Works with KX-TG6840 Series and KX-TG7870 series models</br>Handset Speakerphone?? Intercom (Handset-Handset)</br>Light-up Indicator with Ringer/Charge Alert</br>Large?? 1.8"hite Backlit Handset Display</br></br>Product Description</br></br>Additional Digital Cordless Handset for the KX-TG684X Series and Link2Cell Bluetooth Cellular Convergence Solution</br><br/>http://www.amazon.com/gp/product/B00BS4D2CUUa