Acoustic Research WS2PK63 Wireless 900 MHz Speakers with transmitter – NEW. Acoustic Research outdoor lantern wireless speakers WS2PK63 with Transmitter. Also included is an extra Transmitter. This is a used set but works very well. Nice addition to help relax in your back yard. This item is in the category “Consumer Electronics\Portable Audio & Headphones\Audio Docks & Mini Speakers”. System Configuration: See label. Type: Portable Speaker System. Audio Inputs: 3.5 mm Jack, Stereo L/R RCA. Model: Accoustic Research WS2PK63. RMS Power: See label. Country/Region of Manufacture: China. Audio Inputs: Stereo L/R RCA. RMS Power: 20W Minimum. Configuration: 2.0 System. MPN: Does Not Apply.