MAGNETIC TWIN DESIGN: Two 5000mAh hand warmers snap magnetically together so you can choose between a powerful double-sided heater, or individual hand warmers. Light and ergonomic design – comfortable to hold one in each hand, share with a friend or even charge your device with one while warming your hands with the other FAST HEATING WITH 4 HEAT SETTINGS: No waiting to warm up – rapid start in under 10 seconds then choose from 4 heat levels betweeen 40 and 55℃, the heat level is clearly indicated by the LED display. 6 – 9 hours of heat provided depending on the heat level you choose USB C POWERBANK: Never run out of charge again unit can also be used to charge mobile phones and other devices to give a power boost when you are out and about. Instructions for this function: Ensure the hand warmer is switched off. Plug mobile device into the hand warmer. Lights will display the level of charge remaining EASY AND FAST RECHARGING: Charge using the included USB cable from low to full in a few hours. Recharge units individually so you can continue using one while you’re recharging, great for working on the go SIMPLE OPERATION: To charge the handwarmer: Ensure the hand warmer is switched off / Plug into any USB port/charger using cable supplied / Charge until all four lights are illuminated. To operate the handwarmer: Press and hold ON/OFF button for 4 seconds to turn ON. Press ON/OFF button again to select heat setting. Press and hold ON/OFF button for 4 seconds to turn OFF DIMENSIONS: 9.8 x 3.2 x 2.8 cm (each) | WEIGHT: 109g (each) CE Certified, ROSH compliant