Common onboard controls include soundhole-mounted Volume and Tone sliders, a Blend control for mixing mic and pickup, a phase switch for feedback control, mic trim, and a voicing switch to adjust overall voicing for different guitars or amplification setups.

Guitar pickups are listed at 2.65" (67.3 mm) to fit most guitars with about 2.5" (63.5 mm) string spacing. Ukulele pickups are listed at 2" (50.8 mm) and fit most ukuleles up to roughly 1.85" (47 mm) string spacing.

Descriptions emphasize a super low-noise onboard preamp and repeatedly note a clear, transparent tone with strong, dynamic string response.

Typical systems pair an undersaddle pickup with an endpin-jack–mounted preamp, add a multi-position cardioid condenser microphone (some models use a gooseneck or compact mini mic), and provide a soundhole-mounted Volume and Tone module with a Blend control. Some listings also note phase and mic-trim controls. Batteries are listed as optional and are not included.

These systems use cardioid condenser microphones, described as multi-position soundboard-mounted capsules or compact mini/gooseneck condenser mics to enable onboard mic blending.

Systems come in wide and narrow formats and include both guitar and ukulele versions. The wide format is described for a 1/8" wide saddle slot. Guitar pickup length is 2.65" (fits most guitars with ~2.5" string spacing) and the ukulele pickup length is 2" (fits ukuleles up to ~1.85").

Module heights range about 2.5–2.63 inches, widths about 4.75–4.9 inches, depth is commonly 6.5 inches, and weights range about 0.66–0.8 pounds across the modules shown.

Blending is handled by a dedicated Blend control or Blend module (often placed on the treble side of the soundhole) so players can mix mic and pickup at their fingertips. Some systems also provide mic trim control, a phase switch, and accessible blending when used with a gooseneck mic.

One model lists a "scoop" Tone control that cuts mids while boosting treble and bass. Listings also note onboard Volume and Tone controls and an accessible voicing switch for overall voicing adjustments.