With a compact design and 10 hours of constant heating power the HOTRONIC XLP 1P BT is a Lithium-Ion battery made to deliver high-performance warmth when it is needed most. These Bluetooth app driven controls allow you to access 6 heat settings and a Power Boost level from any iOS or Android smartphone. Customize your comfort throughout the day, there’s even a sleep mode for when you’re in transit or taking a break in the lodge. For the person looking for all day heat the XLP 1P BT is a less expensive option when compared to the 2P, and is the choice if you are confident you can recharge overnight between your days out and don’t need that 18 hours of power. If you’re taking these on winter camping trips, don’t anticipate being able to recharge, or just want more power so you can stay out well into the evening hours, pick the 2P. For those confident that they’ll be tucked up with a power supply and another day of winter ahead, the 1P gives you Bluetooth capabilities in a nicely sized battery that tucks into your socks.