bluetooth mouse small for surface pro 2 that needs no dongle

[unwashed potato!]

i'm looking for a bluetooth mouse that is decent quality and doesn't require a bluetooth dongle to be used as the surface has bluetooth built in.

i'm not sure if this is the case for all bt mice or not so hoping you guys can confirm and suggest a decent one.

not lookinng to spend more £20 if possible

 

[unwashed potato!]

bump

 

[mark2410]

if you google the little microsoft one. search "Microsoft Bluetooth Notebook Mouse 5000 " youl see it.