Avantree 40 hr Wireless Wired Bluetooth Over Ear Headphones with Mic, aptX HiFi Headset, Extra COMFORTABLE and LIGHTWEIGHT, NFC, Stereo for PC Cell Phone Laptop - Audition [24M Warranty] Superior hi-fi sound experience high-resolution sound with apt hi-fi technology. Excellent sound reproduction with wide Audio range producing rich bass and clear treble, challenging many much higher priced headphones on the market. Wired to wireless...Easily Whether you want to use the headphones in wireless mode or switch to a wired connection to save your device's battery life, Our headphones have you covered. Our long battery Lasts up to 40 hours of playtime in wireless mode so you can feel free to stream away! (Note: built-in mic and control buttons Only work in wireless mode) Comfortable & convenient designed with you in mind, Our earphones feature Ultra light, super soft protein ear pads & an adjustable headband for all day wear. To use with devices that are not Bluetooth-enabled, pair with Asante or privy III transmitter to connect and still enjoy a lag-free streaming experience. Multi point and easy to reconnect to two phones simultaneously and never miss a call. Use the NFC feature for easy one tap Connection. After initial pairing headphones auto-reconnect to any device, easily and instantly. Buy one for yourself and an extra set for an Audio lover you know today! What you stands behind this product with a 24 month Warranty. In addition our responsive email support team are also available. Works with ANY Bluetooth-enabled transmitter e.g. phone, computer, transmitter, etc. Can use for extended periods - up to 40hr battery life. (Results may vary depending on volume settings and other conditions etc.) Use with an aptX certified Bluetooth transmitter to experience only 70ms of audio latency. Most other standard headphones will typically have a 220ms delay Easily adjust audio volume from the Audition / connected device Ultra-comfortable fit with a very light 180g weight aptX stereo for high quality music streaming These are not <span class="a-text-bold">Active Noise Cancelling</span> headphones. Passive noise isolation ONLY. Cannot actively eliminate noise like<span class="a-text-bold"> Active Noise Cancelling </span>headphones Built-in mic &amp; control buttons do not work in wired mode Bluetooth operation range may be affected by obstacles (concrete walls, doors,etc.) and other environmental factors Expect an audio delay (of approx 200ms) if used with non-aptX-LL devices - not ideal for watching TV / movies Non-Bluetooth enabled TVs need a SEPARATE transmitter to work with the Audition Bluetooth V4.0 with EDR Support profiles: headset, handsfree, A2DP, AVRCP Operation range: Class 2, 10 meters Up to 40 hours music time and 20 days standby time Driver size: 40mm Impedance: 32 ohm Frequency Response 20Hz-20KHz Ear pads inner diameter: 6.3cm (length)* 4cm(width) Ear pads outer diameter: 10cm (length)* 8.5cm(width) Headset size: 180mm*170mm*80mm Headset weight: 180g Avantree Audition Bluetooth stereo headphones Micro USB charging cable 3.5mm audio cable User manual