AT&T TL7600 Accessory Headset only for TL7610, TL7611, SB67138, and other models, Silver/Black If you have difficulty charging or operating your cordless expansion headset, please download the user manual available below in the Product Details section, and see trouble shooting tips available beginning on page 27. Or call AT&T's customer service team at 1 (800) 222-3111 Accessory Cordless Headset Works with TL7610 &amp; TL7611 and select AT&amp;T Cordless Phones Kindly refer the user manual for product info and the troubleshooting steps AT&T DECT 6.0 Digital Technology Unsurpassed Range up to 500 feet Extended Battery Life - 9 Hours Talk Time Wirelessly Connects to any 2008-2010 AT&T DECT models Lightweight/Comfortable Design