Sena 33i Bluetooth Communication System

The Sena 33i is a Bluetooth intercom system with Mesh intercom that lets a climber and ground crew talk hands-free without carrying separate radios. Crews like Sena bluetooth intercom systems for quick pairing and clear audio.

How crews use it

Mount the unit on each crew member's helmet, connect over Mesh, and everyone can talk without pushing a button. That makes rigging calls, drop-zone clears and climber requests faster and clearer.

The 33i was designed for riders, so check fit on your helmet and how it works alongside your hearing protection.

Mesh intercom lets several people join the same conversation, so the climber, the groundie on the lowering device and the person running the chipper can all hear the same calls. That cuts down on relayed messages and missed warnings.

Bluetooth also lets you take a phone call or check directions between jobs without taking the helmet off.

Practical notes

Keep it charged and protected from sawdust and rain as well as you can. Range and audio depend on terrain and setup, so test on site.

Radio talk does not replace agreed hand signals and a clear call-and-response routine. Have a backup plan if a unit dies.

Make sure the speakers do not interfere with your hearing protection. Communication gear should never replace earmuffs or plugs around saws and chippers.

Follow your helmet maker's guidance on accessories, and do not drill or modify a helmet shell to mount it.