Sanwa Supply Waterproof Hands-free Loudspeaker Speaker MM-SPAMP6

[Maximum practical output]: 16W [Frequency characteristics]: 80Hz~12KHz [Speaker format]: Sealed full-range speaker (magnetic shielding design, splash-proofing) [Speaker unit size]: 3 inches (diameter approx. 77.8mm) [Load impedance]: 8Ω [Microphone input (speaker section)]: 3.5mm microphone jack [Power supply (speaker part)]: Uses 4 AA batteries [Continuous use time (speaker part)]: Approximately 15 hours (medium volume) Please check the Sanwa Supply website for product support and details.