La primera entrada es siempre la fuente del pin. La confianza global es una media ponderada de la firmeza con la que cada referencia respalda las horas de inicio y fin usadas arriba; una referencia cuenta la mitad por cada 180 días que sea más antigua que la más reciente.
No source gives an exact on-sale day. Sony's own press release of September 7, 2026 (https://sony.mediaroom.com[3]/2026-09-07-Sony-Electronics-Introduces-WH-1000XM4C-M4-2nd-Gen-Wireless-Noise-Cancelling-Headphones-and-Updates-Popular-Mid-and-Entry-Level-Wireless-Headphones-with-WH-CH730N-and-WH-CH530) states the WH-CH730N is available 'from September 2026', and Engadget's[4] write-up of the same release says Sony 'will ship the WH-CH730N this month'. Dated to the last day of the stated month, September 30, 2026, as an estimate.
What Hi-Fi's own headline, "Sony[1] has finally upgraded its budget five-star wireless headphones range," backs the pin's claim about an updated Sony budget model from a respected audio review outlet, though the article body itself could not be retrieved to confirm the specific battery or ANC specs.
Sony's[1] own press release, published 7 September 2026, one day before the pin's stored date, confirms the WH-CH730N update with "improved call quality, and longer battery life from its predecessor," though it cites "up to 50 hours" battery life rather than the 75 hours in the pin's description - a discrepancy worth noting.
Engadget's launch report says the WH-CH730N "promises up to 10 percent less noise through a revised ANC system", adds 10-band and gaming EQs, background music mode and a new safe listening mode.
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