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.