Smarkey Heated Jacket system Smarkey heating element uses 8.4V power, all internal voltage does not exceed 8.4V, safe voltage for human is within 36V. All current carrying components are insulated, no current will pass human body Smarkey Women Heated Jacket Slim Fit Design To turn on, press and hold the heated jacket power switch for about 3 seconds. The Cordless Heated Jacket will begin to preheat (5 minutes) and then adjust to the medium setting.Temperature setting can be adjusted at any time by pressing the Cordless Heated Jacket power button. Each press will cycle through the heated jacket’s temperature settings. Pre-Heat - Red LED fades on and off High - Red LED continuous Medium - White LED continuous Low - Blue LED continuous 3 heating zones across the left & right chest, mid-back Women's heated vest designed with the ultra-thin and flexible heating elements generate 3 heating zones across the left & right chest, mid-back. 5000mAh battery can support up to 10 hours heating. One-touch LED controller One-touch LED controller with 3 heat settings (high, medium, low) indicated by a colour coded LED. Press the button and keep 3-5 seconds and jacket will power ON/OFF. Machine Cold Wash Machine Cold Wash and dryer safe. Heated Vest with Battery Pack 7.4V Women's Heated Vest with Battery Pack 7.4V, Lightweight& Slim Fit insulated Electric Vest. Men's Heated Jacket Women's Heated Jacket Women's Heated Vest Men's Heated Vest Battery and Charger Include ✓ ✓ ✓ ✓ Battery Capacity 7.4V 5000mAh 7.4V 5000mAh 7.4V 5000mAh 7.4V 5000mAh