I see the boom mic but does it have the small little circle mic ?

Yes, mine also came with the wired mic.

does Sena system match or pair up with riders that wear Cardo systems?

Sena has universal intercom pairing so that you can use your Sena Intercom with a Cardo. Refer to Sena's site for more info.

How is the connectivity with previous Sena units (non mesh, etc)? Are there any compromises there?

There is the Sena +Mesh unit that connects via bluetooth with Sena non-mesh units and connects with the 50-R perfectly and easyly through the intermcon feature.

Control Method	Touch
Controller Type	Jog Dial
Control Type	Volume Control
Unit Count	1.0 Count
Item Weight	64 Grams
Wireless Technology	Bluetooth
Connectivity Technology	Wireless
Frequency Response	16000 Hz
Impedance	2200 Ohm
Headphone Folding Features	On Ear
Headphones Ear Placement	Over Ear
Style Name	50S (SOUND by Harman Kardon)
Theme	Motorcycle
Color	50S w/ SOUND by Harman Kardon
Battery Average Life	12 Hours
Battery Charge Time	2.5 Hours
Water Resistance Level	Water Resistant
Compatible Devices	Sena
Cable Features	Retractable
Additional Features	Hi Res Audio, Fast Charging
Enclosure Material	Plastic
Specific Uses For Product	Motorcycle Bluetooth communication

50S Motorcycle Jog Dial Communication Bluetooth Headset w/Sound by Harman Kardon Integrated Mesh Intercom System Premium Microphone & Speakers

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