Sansui i3 V4.1 Portable Wireless Sweatproof Sports Bluetooth Earphone with Ear-hooks,Youth Workout Neckband Headphones with Microphone for Running &Gym Exercise,in-Ear Earbuds for Apple iPhone (Gold) 1.Featuring latest Bluetooth V4.1 and CSR 4.1 Bluetooth chip set,noise cancelling technology , the Sansui i3 headphones ensure high-fidelity stereo music and crystal clear speech via DSP Noise reduction technology.Outstanding Bluetooth connection range of up to 33 feet for convenient wireless freedom. 2.Build-in microphone,supports wireless hands free calling, Multi-point Connection,support Connect to 2 Bluetooth enabled devices at the same time and free switch. 3.Ergonomically designed, compact and lightweight in-ear earbuds for comfortable wear, 2 pairs of soft silicone rubber ear tips and 3 pairs of ear hooks of various sizes(S/M/L) to fit your particular anatomy and block outside sounds very well. 4.The behind-the-neck style prevents it from hitting the ground even if they fall out of your ears ,ideal wireless earbuds for the gym, hiking, cycling, jogging, climbing without annoying cables, firmly attached earbuds offer secure fit for sports and fitness. 5.Compatible with most Bluetooth-enabled Smartphones with built-in rechargeable Grade A polymer large capacity battery, lasts up to 6.5 hours talking time,6 hours music time and 300 hours standby time, never worry about it running out of juice.