Adapt DC/USB/Type-C Out Ports: The battery pack is compatible with nearly all 7.4V DC and 5V USB heated vests in the market. With DC4.0/3.8/3.5 mm port (The round plug can be converted to DC 3.8/3.5 mm by the included conversion cables). The Type-C ports support fast charging input and output but lack DC12V output. 12HRS Working Time: 16000 mAh capacity, provides 4-12 hours of long-lasting warmth for 7.4V/5V heated vests, designed for most heated vests, heated jackets, and heated hoodies. Can fully charge iPhone 15 about 4 times.