Features Bluetooth® 4.1 Wireless Technology And Built-In Microphone With Volume Control. High Definition Sound Quality With Deep Bass. Sweat Proof. Hands-Free Design. Simply Pair With Your Device To Enjoy Dynamic Stereo Sound Or Receive Hands-Free Calls. Press Earbuds To Advance Through Selections. Works With Most Audio Devices. Pairs From Up To 30 Feet Away. 55 mA Battery (Charging Cord Included). Up To 3-4 Hours Of Play Time, Up To 3 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 Hit Promotional Products®, Inc. is under license. Other trademarks and trade names are those of their respective owners.