Featuring Bluetooth® 4.2 Wireless Technology And Built-In Microphone With Volume Control. Simply Pair With Your Device To Enjoy Dynamic Stereo Sound Or Receive Hands-Free Calls. Protective Plastic Travel Case. Hands-Free Design. Press +/- Buttons To Advance Through Selections And Hold Down To Change Volume. Works With Most Audio Devices. Pairs From Up To 30 Feet Away. 55 mAh Battery (Charging Cord Included). Up To 2 1/2 Hours Of Play Time, Up To 1 1/2 Hours of Talk Time. The Bluetooth® word mark and logos are registered trademarks owned by the Bluetooth SIG, Inc. and any use of such marks by Promotional Products®, Inc. is under license. Other trademarks and trade names are those of their respective owners.