The XO X33 are 5.3 TWS Bluetooth in-ear headphones with a charging case. The headphones support TWS (True Wireless Stereo) technology, allowing both earbuds to connect with each other and form a wireless stereo set. The portable case features a built-in battery that not only charges the headphones but also provides a secure storage solution for your bag, backpack, or purse. Enjoy hands-free music listening or internet radio while working, walking, exercising, or driving. The XO X33 TWS headphones are an ideal choice for users of smartphones, computers, laptops, tablets, and other Bluetooth-enabled devices, and are compatible with most Android and iOS devices. Additionally, the headphones come with a microphone for easy voice calls. When fully charged, the battery life for calls or music listening is approximately 240 minutes, depending on the volume, thanks to the energy-saving Bluetooth 5.3 technology.