Wireless headphones XO X39 TWS with Bluetooth 5.3 technology. They support TWS (True Wireless Stereo) technology, allowing the connection of both headphones to create wireless stereo sound. Their portable case with a built-in battery offers secure storage and charging function, making them ideal for use in pockets and bags. They are perfect for listening to music or online radio while working, walking, exercising, or driving. The XO X39 headphones are compatible with smartphones, computers, notebooks, tablets, and other devices that support Bluetooth. They are compatible with most Android and iOS devices. They feature a built-in microphone for facilitating voice calls. The talk/music listening time with a full charge is approximately 210 minutes, depending on the volume, utilizing Bluetooth 5.3 energy technology.