Measuring just 4 cm in diameter, the Humbird DuraMobi leverages bone conduction technology to create sound by vibrating the surfaces it’s attached to. The experience varies widely depending on the surface - placing it on hollow boxes or metal panels can result in surprisingly full sound, while dense or uneven surfaces often muffle or distort playback. For best results, it works best on resonant, flat materials like cardboard, thin wood, or glass.

The speaker supports TWS pairing, allowing two units to form a stereo setup, which helps enhance depth and audio richness. Despite its compact size, it can produce volume levels up to 115 dB, though clarity and bass are highly dependent on surface interaction. 

The built-in microphone and FM radio function add versatility, although the FM reception is inconsistent and often limited by environment.

The lightweight design makes it easy to carry, but durability is a concern, especially with reliability of the suction base and adhesive pads, which often fail to hold on smooth or vertical surfaces. Additionally, the battery life can be unpredictable, and frequent recharging may be required. Nonetheless, the speaker is a unique gadget for casual, experimental audio use.