The Allo Sync Device Kit is the battery on its own, for people who already have pods or want to start with the device first. It uses pre-filled pods, so there's nothing to refill: you click a pod in, vape it, and replace it when it's empty. It works with Allo Sync pods and other S-compatible pods, which gives you a decent range of flavours to choose from without being locked to one line. A mesh coil inside the pods keeps the flavour fairly even rather than fading, and a smart chipset manages the draw so it stays consistent. The draw suits a mouth-to-lung style. It's a good fit if you've decided you like the Sync system and just need the device, since it keeps the ongoing cost and waste down by reusing the battery and only swapping pods.