Review on FosPower (3 Pack) 3.5mm Ultra-Slim Audio Headphone Jack Adapter - Male to 🎧 Female, 4-Conductor TRRS, Gold Plated Connector - Compatible with Phones, Tablets, Headphones, Card Readers by Amanda Perkins

One star because this adapter is slightly shorter than my iPhone 6S Plus (which has a headphone jack) when my UNU [Brand] DX-6 Protective Battery Case is included (adds additional iPhone - Add length and width). I bought this phone and battery case (together) legally from my digital repair shop. UNU claims to come with an extension socket, but I didn't receive it when I bought it and the seller doesn't remember what they did with it when I bought it. UNU tech support "promised" me to replace the power strip, but it's been over a week. Foss tech support informed me that they don't have a unit to test with and "it's possible that their extension cord will not fit all phones if it's housed in a battery compartment". The iPhone jack does NOT clog or block the insert, i.e. with the battery case removed, both the Foss extension cord and headphones fit [on their own] and work perfectly. In the real world, there's no way to tell if other brands' extension cords are long enough based on their specs to fit.