To avoid tariffs in most countries, we will declare as follows: US $ 5 / PCS We use high-quality chip and a good speaker, stereo effect is good, clear sound quality. Uses UV curing shell, high hardness, not prone to scratches. Calls only support one ear, listening to music supports two ears. If you watch the video, the sound will be delayed. Suitable for listening to music. Specification: Headphone Weight: 4.8g Bluetooth Version: Bluetooth 4.2 Scope of work: 10 meters (33ft) Standby time: 72 hours Music play / talk time: about 1.5-3 hours Charging time: 1.5 hours Bluetooth pairing method： 1: Turn off the phone bluetooth 2: Press the two headset button, flashing red and blue, release the button Press the button of one headset, fast twice, wait 5-20 seconds one headset goes out and pairing is successful If unsuccessful, press once. 3: Open the phone Bluetooth, connect the headset Any question you want to know, please feel free to contact us, we will be happy to help you immediately.