By tapping on either side of this button, you can also remotely change music tracks. Additionally, a conveniently placed volume button lets you adjust the volume of your music or phone call at any time. The A2DP support lets users wirelessly listen to stereo music and answer or end calls without a separate adapter or having to pick up the phone. The device's pendant-plus-earphone design includes a central control panel that lets users wirelessly advance through songs or change the volume. Maybe really old Macs can't handle it, but we have a PowerBook here that's several years old and does NOT have EDR-capable hardware, yet it handles stereo music over Bluetooth just fine to our iMuffs wireless headphones. I haven't confirmed, but my guess is that Leopard provides Bluetooth 2.0 for any Mac with Bluetooth.