Frequency : UHF 618-870 MHz 2. Frequency Stability : +/- 0.005% 3. Modulation Mode : FM 4. Max Modulation Frequency : +/- 40 KHz 5. Frequency Response : 40 Hz - 20 KHz 6. S/N : 100dB 7. Effective Range : 100M (300 inch) 8. Distortion : 9. Work Temperature : -10C - 50C 10. Batteries : AA 1.5V x 2 11. Pickup Head : Dynamic cardioid directivity (handheld MIC)