Acoustic & STI-PA Set Pro with NTI TalkBox The Acoustic & STI-PA Set Pro with NTI TalkBox contains the instruments and accessories for end-to-end STI-PA measurements, as a complete kit packed in the protective Minstruments Case. The Acoustic & STI-PA Set Pro with NTI TalkBox includes: NTI TalkBox Minirator MR-PRO Acoustilyzer AL1 STI-PA Option pre-installed in AL1 MiniSPL Adapter -20dB for AL1 Minirator -40dB Adapter Cable Test Plug (MR-PRO) Mains Power Adapter MR-PRO MR-PRO 70V/100V Protective Adapter Minstruments Case