Acme United SS-109. System type: 2.0 system, Recommended usage: universal, Speaker placement: Portable. RMS rated power: 2 W, Frequency range: 200 - 20000 Hz, Signal-to-Noise Ratio (SNR): 40 dB. Connectivity technology: Wired, Speaker interface type: 3.5 mm. Housing material: Plastic. Width: 76 mm, Depth: 76 mm, Height: 76 mm