The Koss TWS250i True Wireless In-Ear Headphones offer reliable audio performance with a secure and comfortable fit for everyday use. These headphones feature Bluetooth 5.0 for stable wireless operation and provide up to 6 hours of uninterrupted playback per charge, along with an additional 18 hours via the compact charging case. The ergonomic in-ear design includes three sizes of silicone ear tips for an optimal fit and passive noise isolation. With an IPX4 rating, they are protected against sweat and light moisture, making them suitable for training and outdoor activities. The built-in microphone allows for clear hands-free calls, while intuitive touch controls on each earbud manage playback, volume, and call functions. The charging case measures approximately 6.5 cm x 3.5 cm x 2.5 cm and weighs 45 g, with each earbud weighing 5 g. The audio specifications include a frequency response of 20 Hz to 20 kHz and a 10 mm dynamic driver per earbud for balanced sound reproduction. The successor to previous Koss wireless in-ear headphones is compatible with most Bluetooth-enabled devices and supports standard audio codecs for consistent performance. These headphones prioritize durability and user-friendliness through their lightweight design and practical features.