New York - Sirius XM Radio (NASD: SIRI) and device partner Pioneer Electronics on Thursday introduced the XMp3 wearable satellite radio and MP3 player, which it says is the lightest and most compact receiver yet, and the first to offer simultaneous, multi-channel recording capability. The $279 device includes an auto-record feature that can store up to 30 hours of radio programming, as well as a DVR-like feature that automatically buffers the most recent 30 minutes of programming for easy replay.