Yealink LCD expansion module- 160×320 graphic LCD with 16-level gray scales- 20 Physical keys each with a dual-color LED- 20 Additional keys through page switch- Supports up to 6 modules daisy-chain- Different icons for each function shown on the LCD- Dial-color LED for status information- Supports busy lamp field, bridge line appearance- Programmable for speed dialing, call pickup, intercom, hold, transfer, voicemail, forward, DND- Applies to Yealink IP phone SIP-T28P and SIP-T26P and SIP-T38G- Expansion module is powered by the host phone- 2xRJ12 6P6C ports for data in and out- Weight: 290g