Monster Power Rockin' Roller 270 is a versatile indoor/outdoor wireless speaker with a powerful sound system, long battery life, and various connectivity options. Enjoy your favorite music via Bluetooth, AUX input, or FM radio. Connect instruments or microphones with the built-in 1/4-inch inputs and adjust the gain and echo levels independently. Utilize the USB power bank to charge your devices on the go. Link two speakers together wirelessly with True Wireless System (TWS) for an immersive stereo experience.