Voltage-insensitive potassium channel (PubMed:11374070, PubMed:15677687). Channel opening is triggered by mechanical forces that deform the membrane, and by raising the intracellular pH to basic levels (PubMed:11374070, PubMed:15677687). The channel is inactive at 24 degrees Celsius (in vitro); raising the temperature to 37 degrees Celsius increases the frequency of channel opening, with a further increase in channel activity when the temperature is raised to 42 degrees Celsius (PubMed:15677687). Plays a role in the perception of pain caused by heat (By similarity). Plays a role in the sensory perception of pain caused by pressure (By similarity). Activated by arachidonic acid. Homodimer; disulfide-linked. Detected in brain, and at much lower levels in liver, skeletal muscle and testis. Channel opening is brought about by a conformation change that involves buckling of the second transmembrane helix and affects the position and orientation of the fourth transmembrane helix. Belongs to the two pore domain potassium channel (TC 1.A.1.8) family.