No ON/OFF button so jacket can be turned ON/OFF right from jacket without having to turn battery ON. This 7.4-volt battery.  To learn more about which garments are compatible with what batteries, check out our .

Specifications:

• Rating: 7.4volts, 2200mAh
• Input: DC 8.4volt,1,000mA
• Charge Time: 3-4 hours
• Size Inches: 2.9in x 1.7in x 0.57in
• Size Metric: 73mm x 42mm x 14.5mm

Garments Compatible:

• Phase Hoodies, Backcountry Jackets and Vests, Merino Baselayer, Proton Baselayer, Peak Vest, Trek Vest, Alpine 2.0 Jacket.