Original Logitech USB Receiver for Logitech MX 5500 Revolution M/N Y-RBF91 (Keyboard)， M-RCL124 (Mouse)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Brand New Original Logitech Receiver (993-000141) for Logitech Cordless Desktop MX 5500 Revolution </span></li><li><span class="a-list-item"> This Receiver will work Only With M/N Y-RBF91 (Keyboard)， M-RCL124 (Mouse) </span></li><li><span class="a-list-item"> The part number on the bottom of the keyboard must match this number 820-000814 </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31VgKFyBd%2BL.jpg" noproxy>