Earplugs turn into headphones in seconds Ordinary anti-noise earplugs, plug-in and detachable Insert the earplugs into the case and turn them into factory headphones in seconds, easy to use Ultra-light aviation aluminum alloy case High strength, good resistance, material, sturdy and Ergonomics No pain when worn for a long time Wide compatibility Plug and play 3.5mm universal interface Say goodbye to noise Triple sound insulation barrier weakens layer by layer Interface: 3.5MM Wearing method: earplug type Purpose: Noise-canceling headphones Plug type: straight plug type Colour:As Shown Material:Polyester+Silica Gel+Aluminum Alloy Package Contents: 1x headset 1x Bluetooth receiver 1x pin 1x clip 1x storage bag 1x data cable 6x earplugs Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.