This product is a for M12 adapter with a USB DC hole design and a key switch. You can plug in the applicable M12 battery to charge your mobile phone and use it inside air-conditioned clothes or heated jackets. escription: [Compatibility]Power Adapter Compatible for 12V battery packs 48-11-2401, 48-11-2402, 48-11-2420, 48-11-2430,48-11-2440, 48-11-2460 etc. [USB & DC Ports]: Adapter With 5V 2.1A USB port and one 12V 3A DC port, it provides charging for most electronic devices, like phone, tablet, and also charges for 12V battery Heated Gear for increased functionality, It's perfect for at work or outdoors. [Easy installation]This 12V Portable Power Source Adapter Made of fireproof material, Professional compact design and easy installation. For a long time don't use, please separate from the battery [Superior Features]: The battery converter has small size, which is easy to carry and store. Specification: Type: Adapter Material: plastic Battery Type: Lithium-Ion(not include) Compatible with: For 12V lithium battery Color: Red Package Contents: 1 x Adapter (Batteries not included) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.