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Yapalong 4000 Referee Communication System | (7-User) Complete Set The Yapalong 4000 (7-User) Complete Set is a full-duplex, open communication referee system built for soccer and football crews that need instant, natural talk— no push-to-talk required. With encrypted transmission, 8+ hours of battery life, and up to a 300-meter line-of-sight range, it’s designed to keep larger crews coordinated on positioning, game management, and fast decisions. You’ll also get superior & safe sound quality, including an automatic whistle volume reduction feature (user adjustable) to help keep audio at safer listening levels. And because the system is expandable up to 8 users, you’ve got room to scale up for bigger assignments. Features Full duplex open communication: No push-to-talk required for real-time crew coordination. Superior & safe sound quality: Whistle volume is automatically reduced to safe levels and can be adjusted by the user. Lightweight, compact receivers: Approximately 4" x 2.5" and 4.2 oz each for comfortable wear. Encrypted transmission: Helps keep communication secure and stable. 8+ hours battery life: 1700mA rechargeable power for full match days and tournament blocks. Up to 300m line-of-sight range: Reliable coverage for most fields and sideline-to-sideline communication. Expandable system: Grow from 7 users up to 8 users as your crew needs change. 1-year manufacturer warranty: Added confidence for season-long use. What’s Included Ref-Comm (7 User) Referee Communication System Includes: 7 audio receivers 7 PRO armbands 7 shorts holsters 7 rechargeable USB kits with detachable AC/DC adapter 7 boom microphones, choose between two options Open Mic, or Push-To-Talk Optional accessories are also available, including Ref-Comm Carry Case, Ref-Comm World Cup Headset and more. For more information about Ref-Comm, please read our Ref-Comm Frequently Asked Questions and Ref-Comm Binding Procedure pages. Why Shop at Referee Store When you’re buying referee com