Hollyland Solidcom C1 Pro-4S Full-Duplex Wireless Intercom System with 4 Headsets (1.9 GHz)

Key Features
Four-person wireless intercom system
One master headset and three remote headsets
Full-duplex, simultaneous two-way communication
No hub or beltpack required
1.9GHz DECT wireless technology
Up to 350m line-of-sight transmission
Dual-microphone Environmental Noise Cancellation
Approximately 20dB noise reduction
Wideband 150Hz–7kHz audio
Acoustic Echo Cancellation
Talk, mute and Push-to-Talk functions
Microphone-boom mute control
Secure encrypted communication
Automatic pairing out of the box
Rechargeable and replaceable batteries
Two batteries supplied for each headset
Lightweight single-ear design
Comfortable leather and foam ear cushions