Kraun KP.F9. System type: 1.0 system, Recommended usage: universal, Speaker placement: Portable. RMS rated power: 2.5 W, Frequency range: 180 - 20000 Hz, Impedance: 4 Ом. Connectivity technology: Wired, Speaker interface type: 3.5 mm. Width: 90 mm, Depth: 40 mm, Height: 60 mm. Battery technology: Lithium, Battery type: CR 2032