Compact Design: he development board is small High quality for professional use Adopting advanced technology, convenient and no noise Simple operation, easy to use Replace the damaged parts to long and better work performance Specifications: for M950/M905/M705/M515/M510/M505/M310 M525M720 M325 M235 M585 M590 M600 MX ANYWHERE ANYWHERE2S MX MASTER MASTER2S Due to different batches, there may be differences in product appearance and printed text, which will not affect use Colour:Black Material:ABS Package Contents: 1x USB Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.