Special featuresBattery pack BL1055B, in boxBattery connection on the side of the jumper.Comfortable heating from 4 heating elements, 1 on the abdomen, 1 on the back, and 2 at the wrists.Read the safety instructions and user manual carefully before use.Supplied adapter also usable with our ventilated clothing.Preselection of three heating settings via a button with LED indication of the selected setting.Heated undershirt made of thin and elastic material.Machine washable at a maximum of 30°C.Technical dataColour: black Operating time low (BL1040/41B): 15 : 00 hoursPlatform: LXT / CXT Operating time medium (BL1040/41B): 07 : 00 hoursOperating time high (BL1040/41B): 03 : 30 hoursLining: Polyester (100%) Heat settings: High/medium/low Outer layer material: Polyester (100%) Volts (voltage): 10.8-18 VWashing instructions: 30 °C Tumble drying: Yes USB port (mobile device charging): 1 Documents User manual