C2G/Cables to Go Audio Unlimited 900MHz Wireless Indoor/Outdoor Rock Speaker (Rechargeable) with Dual Power Transmitter, Granite (SPK-ROCK3) Operating Distance: Up to 150 feet. Speaker Design: 2-way Frequency: 900MHz. Output Power: 15Watts RMS, 100Watts PMPO Frequency Response: 40Hz-12KHz S/N Radio: 65dB Voltage: Transmitter, DC 12V 150mA. Speakers, Built-in Rechargeable Battery or DC 15V 1A adapter. Speakers, Built-in Rechargeable Battery or DC 15V 1A adapter. Place the speaker indoors during. 1) Rain, Hail or Heavy downpours. 2) Snow. 3) Temperatures below 14F, above 122F