iFrogz FreeRein Reflect Wireless Bluetooth Headphones - Grey Powerful: A 40 mm driver delivers pounding bass and clear highs that are ideal for any music at any volume. Clever: A 3.5mm jack lets you plug in and enjoy your playlist when you want a wired connection. Comfortable: The padded ear cups provide hours of comfortable listening and then fold flat for easy portability. Lasting: With a rechargeable battery that lasts up to 20 consecutive hours, you can enjoy playlist after playlist in complete audio bliss.