Avantree Quartet 2 — Wireless Group Listening System (Transmitter + 4 Rechargeable Headphones), Bluetooth/Optical/AUX, Scalable to 100, 2.4Ghz Low-Latency 25ms

This Quartet 2 kit from Avantree pairs a transmitter with four rechargeable headphones to stream the same audio to all 4 headphones simultaneously. The transmitter accepts Bluetooth, optical, or AUX inputs and works with devices like your phone, laptop, mixer, AVR, projector, and TV. For larger events you can expand the setup by adding up to 100 add-on Quartet headphones to a single transmitter — great for silent discos, churches, parties, and outdoor movie nights. The system uses 2.4Ghz technology to minimize lag to 25ms, a dramatic improvement over the 220ms typical of standard Bluetooth and even faster than the 40ms of aptX-Low Latency. Each headphone pair includes its own volume control so users can set listening levels independently without affecting others. Choose between two EQ options: Clear Voice Mode to emphasize speech or the balanced EQ for a more natural sound signature.