Bluetooth - Play and control your music and apps like Spotify / Pandora wirelessly. Make or receive calls using the built-in microphone and speakers | Pairing - Easy pairing with auto reconnect keeps the last device in memory so that once in range again, you can play your music in seconds. Use both or just one speaker | Media Playback - The 3. 5 mm AUX input is compatible with the audio output from smartphones and MP3 players. Use the USB/SD (32GB max) ports for more options | Fully Marinized - All of the major components have been specially coated sealed to protect against the environment | Voice Prompts - The BOLTBLK will let you know when a successful Bluetooth connection has been made, or when its battery is too low | Power Saver - To save power, the speaker turns off automatically after 9 minutes of inactivity unless included USB power cable is plugged in | Buttons - Control your music with Volume, next/previous track, pause and play buttons | Specs - Signal to noise ratio: ≥ 70dB, THD+N: <10%, Dimensions: 2. 6” x 2. 6” x 8. 3”, Weight: 0. 93 lbs. | BOSS Audio Systems provides a powerful 3-year platinum online dealer so long as the purchase is made through . We strongly encourage professional installation of this product to ensure proper and safe functionality