With IWP™ Technology, you just have to open the case and the earbuds automatically pair with your device in an instant. You can tap into 4 times the charge with its 650mAh carry cum charging case that offers a playtime of up to 12 hours. With a battery capacity of 40mAh for each earbud, indulge in blissful audio experience for up to 3 hours in a go. Tap into instant wireless functionality with optimum Bluetooth V5.0. The TWS Airdopes 138 come equipped with 13mm drivers that pump out immersive sound. The stereo calling feature lets the user indulge in smooth and clear chats over calls. One can access the instant voice assistant by just a single press via the Multifunction Button control.