OCOOPA Hand Warmers Rechargeable, Battery Replaceable Electronic Pocket Heater, 5000mAh Portable Power Bank, Single/Double-Sided Controllable 5 Heating Modes 12 Hours Warmth Tech Gift for Men -Union 5 by Amazon.co.uk

• Battery Detachable & Replaceable Heater: The battery of Union 5 can be removed and replaced, charge the replacement core for endless heat. Replace the core in seconds to get unlimited battery life, long-term warm companionship.

• Energy-saving Hand Warmer: Exclusively designed single/double-sided heating mode. Fits in pockets when single-side is hot, warms both hands when heat on both sides. The single-sided heating mode saves 50% energy than other hand warmers.

• Ultimate Comfort: Perfect size for the palm, 3-second fast heating and constant temperature setting provide the unparalleled heating experience. 3 levels of temperatures 95-107°F/104-118°F/118-131°F at your choice.

• Large Battery Capacity - 5,000 mAh lithium rechargeable battery with USB-C charging port ensures a long using time. It can also be used as a power bank to charge your electronic device at any time.

• What You Get: Ocoopa union 5 hand warmer, Micro USB cable, user manual, USB-C converter, our worry-free 12-month warranty and friendly customer service.