The Sennheiser EW 300 G4-BASE COMBO is a flexible wireless system package from the evolution wireless G4 300 series, operating in the AW+ frequency range (470 to 558 MHz). This "Base Combo" set provides the core wireless electronics without microphones, offering versatility for users to add their own. The package typically includes both a handheld transmitter body and a bodypack transmitter, along with a single-channel rackmount receiver capable of working with either transmitter. This allows a single system to support both handheld vocal use (by adding a compatible capsule) and lavalier or instrument use (by connecting a microphone to the bodypack).

The system incorporates G4 series features such as an enhanced true diversity reception system, a backlit LCD display on the receiver, and an intuitive setup process. It provides a balanced mix of performance and value, making it a popular choice for rental inventories, installed AV systems, and live sound engineers who need a reliable wireless platform that can be adapted on the fly for different presenters or performers. Users can select from Sennheiser's wide range of microphone capsules to tailor the system to their specific needs.