The award winning brydge 12 3 no memory or hard drive and brydge 12 3 pro with 138 gb memory for microsoft surface pro 3 and 4 with an integrated 128gb high speed ssd card up to 600mbs in the external hard drive simply open the screen to the perfect angle from 0 180 degrees without the need of a kickstand and get the most out of your surface bluetooth 3 0 with 3 month rechargeable battery lighter than a surface book when paired with the microsoft surface pro the brydge 12 3 only