The Earmark hard hat includes ratchet suspension. Not only won't you have to worry about tripping over wires, you won't have to listen to anybody's telephone conversation either. Both systems, Headsets and Belt-Paks, available in two man Duplex and multiman Simplex arrangements. For your convenience Earmark offers two choices in rechargeable power systems. The RPS does not compromise the device's Intrinsic Safety Rating.
Battery capacity is about half that of an alkaline cell.
If you don't need Intrinsic Safety, Earmark provides 8.4 Volt, standard rechargeable cells. Offering about half the capacity of the RPS, these cells substitute for 9 Volt alkaline batteries without product modification. Repeating Radio Systems Repeating Headset and Belt-Pak Systems provide a completely mobile task team whose supervisor or team leader always has a clear transmitting frequency. It always has a clear channel for transmission. All other radios share a common transmit frequency so they speak one at a time.