• ULT Button for Bass Boost • Dual Passive Radiators • 3.3 x 1.7" Woofer & 0.6" Tweeter • Dust, Water, Shock & Rust-Resistant • Up to 12 Hours of Battery Life • Built-In Mic for Hands-Free Calls • Microphone Echo Cancellation • Pair Two for Stereo Sound • Detachable Multi-Way Carry Strap