1 by the global open 2.4 G frequencies, the frequency hopping technique, 2. As much as 32K sampling rate, sampling accuracy 16b ... Product synopsisFeatures:1 by the global open 2.4 G frequencies, the frequency hopping technique,2. As much as 32K sampling rate ... : - 10 ~ + 55 oCStorage temperature: - 30 ~ + oC 85Work humidity: 85% R 2.4G teaching wireless microphone