One wire ear hook earpiece with PTT in line. One wire kits.
Can be made for most radio especially the TETRA terminal or digital radio such as:

Sepura STP8000, SRH3500, SRH3800, SRP2000, SRP3000

Motorola MTH800, MTP850, MTP850S, Mototrbo DP2400/DP2600/DP3400/DP3600 and DP4000 series. The XPR3300/3500/6300 and so on.

EADS THR 880i, THR9i