The JBL Extreme 4 is a powerful portable Bluetooth speaker that delivers powerful sound in a durable and rugged package. With a battery life of up to 15 hours, it's perfect for taking your music on the go. The speaker is waterproof and dustproof, making it suitable for outdoor use and pool parties. Boasting a frequency response of 48Hz - 20kHz, the JBL Extreme 4 provides deep, rich bass and crisp highs. The built-in power bank also allows you to charge your devices while on the move. Whether you're at the beach or having a backyard barbecue, the JBL Extreme 4 will be the life of the party.