This system provides an answer-back siren that activates in conjunction with door locking and unlocking. It produces a "chirp chirp" sound, similar to American cars. The speaker comes with a waterproof connector. The output to the siren is negative, so the positive wire connects to constant power. I installed this in a Prius 30, with the wiring done near the driver's side footwell. It's compact. I have confirmed the operation of the system before listing it. No refunds or returns. The shipping cost will be considerable, so please refrain from asking for a discount. Please feel free to ask any questions you may have.