Clear sound for both headphones (media / in-call and microphone)
Standard Micro USB charger (although only a USB / Micro USB cable supplied, not a wall socket)
Tiny USB dongle with firmware paring (similar Unify dongle for their keyboards)
A physical switch between off/bluetooth/dongle
No flashing lights
Range (can actually go 10M away from the phone)
They can be folded
I've been through an array of devices and this is the first I've been willing to say is good.