The smallest earbud connection is extremely good, connects very easily to phones and you can walk away. Was able to make it 2 large rooms away before it lost connection! That is an extremely long way for this headset being so small!</br>Built-in high performance rechargeable Lithium-poly 60mAh battery. Charge 1.5 hours support 6hrs call time or 5-6hrs music playing(at middle volume).Supports Multipoint Technology: connects 2 smartphones and answer calls from either one.</br>The sound is crazy good! Normal only at about 1/2 - 3/4 the volume is enough, Hands-free Calling,CVC (Clear Voice Capture) noise cancellation technology makes sure your voice is loud and clear ,you can hear whoever you are calling and they hear you fine as well</br>Ergonomically designed to simply stay in place fit like a glove. Comfortable small and light weight that make you forget have it on while in use.Fits either ear(left and right ear). It lightweight and sweat-proof best for running</br>Earbuds that work with all smartphones, tablets and music players. Latest Bluetooth 4.1 technology; easy and fast pairing with smartphones, tablets and other Bluetooth enabled music devices.Such as iPhone 4,5,6/6S,7/7S, plus,Samsung Galaxy Note 3,4,5,S5,S6,S7,edge, LG,Sony,Motorola, iPad air(2), iPod Nano, HTC, etc</br></br>Product Description</br></br><b>Freedom to Enjoy </b><br><br> Cut the cord and break away from wires with Bluetooth 4.1. You can enjoy excellent sound performance from this durable, lightweight and sweat-proof headset. Work out and stay fit with clear, natural sound that drives you forward. <br><br> <b>Helpful Tips</b><br><br> <b>1) Pairing : </b> If you can't pair the bluetooth earbud with your phone , please make sure this earbud has been going into pairing mode. (Turn the bluetooth on and keep press the function key about 3-5 seconds until the red and blue lights show alternately). <br><br> <b>2) Connecting: </b>If your phone can't search the Bluetooth earbud, please kindly try to restart your phone. If you can't pair contact seller or official website <br><br> <b>3) Language switch: </b>If you change the language by accident, please try to according to the below step to change it back : <br> A) Power it off. <br> B) Power it on. <br> C) Press the function key about 3-5 seconds until the red and blue lights show alternately(the pairing mode) REMOVE YOUR FINGER. <br> D) Press the function key more 1-2 seconds the red and blue lights show alternately too(voice prompt: English model),the language switching will success <br><br> <b>Specifications: </b><br><br> Bluetooth Version: V4.1<br> Bluetooth Profile: A2DP, AVRCP, HFP, HSP<br> Range: 33 Feet (10m) <br> Working Time: 5-6 hours for music (30-40% volume) <br> Charging Time: 1 hour<br> Charging Input: USB 5V<br> Dimension (L*W*H): 0.8x 0.6 x 0.5 Inch<br> Weight: 0.13 oz<br><br> <b>Package: </b><br><br> Kelodo Bluetooth Earbud (1 Earbud, NOT a pair) <br> USB Charging Cable<br>Carrying Case<br>User Manual</br><br/>http://www.amazon.com/gp/product/B01N646KSD