Motorola Stereo Headset OEM Original SYN2356a / SYN2356. This stereo headset is produced by Motorola specifically for your phone. This Motorola Stereo Headset allows private stereo music and hands-free phone calls (depending on phone). It features a single button to answer and end phone calls. The headset works with any MP3 player and mobile phone with a standard 3.5mm stereo headphone jack. The Motorola Stereo Headset OEM Original SYN2356a / SYN2356 is compatible with any MP3 player and mobile phone with a standard 3.5mm stereo headphone jack.