The EM20 Expansion Module is designed to expand the functional capability of your SIP phone and to improve your work efficiency. For example, you can add up to 20 frequent contacts on the label and dial with only one press. In addition, you can change your contact list whenever you need with the replaceable label. The stand of EM20 is ajustable with 2 angles, same as the stand deisgn of Myriad series, which makes it seamless compatible with Myriad series SIP phones. It can be connected with M3,M5 M7 through USB type A. The EM20 Expansion Module is an ideal tool for receptionists, administrative assistants and contact center workers. FEATURES 20 Programmable hard Keys Replaceable label USB type A (x2) USB type C