Model: BT M20 Dual Wireless Microphone Type: Wireless Microphone System Microphone Type: Lavalier / Lapel Connectivity: Wireless (2.4 GHz RF) Frequency Range: 2.4 GHz Operating Distance: Up to 50 meters (164 feet) line-of-sight Battery Type: Rechargeable Lithium-ionBattery Life: Up to 8 hours Charging Time: Approximately 2 hours Audio Output: Frequency Response: 20 Hz to 20 kHz Signal-to-Noise Ratio: = 90 dB

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Model: BT M20 Dual Wireless Microphone Type: Wireless Microphone System Microphone Type: Lavalier / Lapel Connectivity: Wireless (2.4 GHz RF) Frequency Range: 2.4 GHz Operating Distance: Up to 50 meters (164 feet) line-of-sight Battery Type: Rechargeable Lithium-ionBattery Life: Up to 8 hours Charging Time: Approximately 2 hours Audio Output: Frequency Response: 20 Hz to 20 kHz Signal-to-Noise Ratio: = 90 dB