The AW810 water-resistant design withstands wet conditions encountered outdoors or in kitchens and baths. Its two-way acoustic suspension design features 1" dome tweeter for extended upper frequency response and waterproof 5" woofer for deep bass output. The 15 watt AudioMax(R) Digital Amplifier delivers impressive sound - even outdoors! The amplifier circuitry extends battery life over 100 hours. 8 "C" cell batteries (sold separately) provide true wireless portability; can also plug into any standard electrical outlet with AC adaptor (included). The unit has easy access controls.