The Toshiba DKT3210-SD 10 Button Digital LCD Speakerphone is a digital multi-line telephone with a Liquid Crystal Display (LCD). The DKT 3210-SD has 10 flexible buttons which can be used as programmable features or co lines. Compatible with all Toshiba Strata DK & CTX Systems. The DKT3210-SD is replacement for DKT3010-SD