I can’t even find anywhere it’s available to buy, so I have no idea I’ve found a couple of promising devices that are available from CeX, at a relatively reasonable price - FiiO Q5, Oppo HA-2SE, and Audio Technica AT-PHA100. They’re still a bit more than I wanted to spend, even second-hand, and I’m a bit wary about the battery life I’d be getting. But they all have USB DACs so can double-up as desktop/laptop devices, and finding brand-new headphone amps with analogue inputs is still a challenge.