If you want something simple from Allo without much device to deal with, the Allo Ultra 1600 is about as straightforward as it gets. You draw on it and it fires, no buttons, no setup. It holds 6 mL of e-liquid and is rated for around 1,600 puffs, though that varies with how long and hard you pull. The 1000 mAh battery is matched to the juice and isn't rechargeable, so the device finishes when the e-liquid does. A small indicator light tells you when the battery is getting low, which takes the guesswork out of the last day or two. The coil sits at 1.5 ohm, a tighter draw that suits a mouth-to-lung style closer to a cigarette. Nicotine is 20 mg/mL salt. It's leak-resistant as well, so it travels in a pocket or bag without much fuss.