This wrist wrap has a built-in battery operated heater that warms your wrist to around 130° F (54° C). It warms the blood vessels to your fingers keeping them warm too. The wrap is made from durable elastic fabric material with a pouch for the rechargeable battery. It has a fiber heating panel inside. The 2500mAh battery lasts a couple hours. Just plug it into any USB wall or car charger; once fully charged, sit and enjoy instant-on toasty warmth.
The low voltage heating fiber is completely safe. The small and lightweight battery can also be used to recharge mobile phones or power other devices such as MP3 players, digital cameras, tablet PCs, etc.
INSTRUCTIONS FOR USE
TO CHARGE Use a mini-USB to USB cable and connect the mini-USB connector into the battery and connect the regular USB connector into any USB wall charger or PC. It may take several hours for a first time charge. The LED will blink RED during charge and solid RED once fully charged.
1. Just connect the battery to the heaters USB connector.
note - Solid Green light when in use and blinking Green light when nearing battery discharge.