SYNCO Xtalk XPro2 2-Person Wireless Intercom Headset System 2.4G Wireless Headset with Microphone Built-in Battery 500M/1640ft Transmission 3.5mm Real-time Monitoring for Filmmaking Live Broadcasting Stage Performance Teamwork Communication Headset Wireless Technology: Digital 2.4G Transmission Mode: Full-Duplex Operating Range: 500m (LOS) Frequency Band: 2.4G Latency: About 120ms Approximate RF Sensitivity:<-90dBm Radio Output Frequency: 20dBm Power: USB-C DC 5V Battery Capacity: 1050mAh Working Time: 24H Charging Time: About 2.5H Frequency Response: 150Hz~7KHz One-click Noise Cancellation: Supports Signal-To-Noise Ratio: >65dB Distortion: <1% Microphone Type: Condenser Microphone Max Input Sound Pressure Level:>115dBSPL Output Sound Pressure Level: Typical 98+3dBSPL (at 94dBSPL 1KHz) 3.5mm Input: Available for Monitoring Temperature Range: 0℃-45℃(Working Status) -20℃-60℃(Storage Condition) Weight: About 194g (Battery Included)