Xinglan Wireless Bluetooth 4.0 In-Ear Noise Cancelling Headphone, Blue Long battery life: Built-in high performance polymer 80mAh battery, 5 hours talking/playing time, and about 160 hours standby time. Simple-to-use: control all functions of your music (volume, sound, song selection) and calls from your phone via our simple-to-use user interface on the headphones themselves. Never fall off when workouts. Ergonomic in-ear design with medical grade silicone ear gels and stabilizers, providing you the most comfortable wearing earbuds full day. Good noise isolation to create the optimal environment for listening to your favorite tunes, built-in microphone with noise cancellation for clear calling and friends chatting. Lightweight and sweatproof design for running.