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Microphone: Digital Silicone Mic Input: 5V Battery Capacity (Mic): 60mAh Battery Capacity (Receiver): 80mAh Battery life: 3-4 Hours Signal-to-Noise Ratio: 64 DBM Transmission Delay: 30MS Sensitivity: -42DB Frequency Response Range: 20-20KHz Transmission Distance: Barrier-Free 20m-30m SKU: GN3IN1WMGN | GN3IN1WMBK EAN: 6935100188980 | 990478121737 Features 20 Meter Access Carrying Case Wireless Transmission 5 Hrs Working Time