Cisco SPA500S Expansion Module<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>32 programmable multicolored LED buttons</li><li>Illuminated line status monitoring (green for idle， red for in use， blinking red for ringing， orange for registration error)</li><li>Call transfer; Speed dial; DSS</li><li>Busy lamp field; One-touch transfer; Call pickup</li><li>Dual images for resilient firmware upgrades</li></ul></div><img src="http://ecx.images-amazon.com/images/I/21Lp8XHjAmL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41KoOKRP6IL.jpg" noproxy>