Audio Connectors - Mini TRS (Tip/Ring/Sleeve - Stereo - 3.5mm) - Chassis Mount (receptacle) - Professional 3.5mm Mini phone jacks are available in TS (Tip/Sleeve - mono) and TRS (Tip/Ring/Sleeve - Stereo) configurations, and are used universally for balanced and unbalanced audio connections between audio equipment, and instruments. CHASSIS MOUNT RECEPTACLES, MINI TRS.