Contemporary Analog 1-Line Accessory Handset with 3 Speed Dials (1 Dedicated as Message Retrieval Key) (C4101) and Upright 6VDC Charger, USB Charging Port (C4011-USB) (REQUIRES A2410, CTM-A2411 , CTM-A2411- BATT, or CTM-A2510). Replacing CTM-A241SD