*3.5mm plug, can be used for iPhone iPod, iPod Nano, MP3 player, Cell Phone, CD player, Portable FM AM Radio, Shoulder Speaker Mic Microphone, etc....
Also compatible Motorola Models:

*GP Series: GP140, GP320, GP328, GP329, GP338, GP339, GP340, GP360, GP380, GP640, GP680, GP1280
*HT Series: HT750 ,HT1250, HT1250LS, HT1550, HT1550XLS,
*MTX Series: MTX150, MTX450, MTX850, MTX950 ,MTX960,MTX1500, MTX4500, MTX1550, MTX4550 MTX8250, MTX8250LS, MTX9250LS
*PRO Series: PR860, PRO5150, PRO5350, PRO5450, PRO5550, PRO5750, PRO7150, PRO7350, PRO7450,PRO7550, PRO7750, PRO9150,
*PTX Series: PTX700, PTX760, PTX780

• 1.Fits two-way radios (audio only), radio speaker mics, remote mics, MP3 players, and other audio accessories with 3.5mm earphone jack.
• 2.Listen/Receive Only Covert Acoustic Tube Earpiece Headset.
• 3.Excellent for use in police, military, nightclubs, bars, paintball, security, restaurants, hotels, bouncer, warehouses and noisy environments.

1.Fits two-way radios (audio only), radio speaker mics, remote mics, MP3 players, and other audio accessories with 3.5mm earphone jack.Caroo