Special characteristicsBattery pack BL1055B, in boxBattery connection on the side of the shirt.Comfortable heating from 4 heating elements, 1 on the stomach, 1 on the back, and 2 at the wrists.Read the safety instructions and user manual carefully before use.Supplied adapter can also be used with our ventilated clothing.Three heating settings can be pre-selected via a button with LED indication of the chosen setting.Heated undershirt made of thin and elastic material.Machine washable at a maximum of 30°C.Technical dataVoltage: 10.8-18 VOuter material: Polyester (100%) Lining: Polyester (100%) Washing instructions: 30 °C Color: black USB port (charging mobile device): 1 Operating time medium (BL1040/41B): 07:00 hoursTumble dry: Yes Heat settings: High/medium/low Operating time high (BL1040/41B): 03:30 hoursOperating time high (BL1860B): 07:30 hoursPlatform: LXT / CXT Operating time low (BL1040/41B): 15:00 hours: : : : : Documents User manual