Hi Mary,
Thank you for reaching out to us! We would not recommend the USB Wall Adapter - 500mA output for the Vape Pen 22; however, the Eleaf Mini USB Wall Adapter (link below) will work great!
http://www.smoktek.com/Eleaf-Mini-USB-Wall-Adapter--1000mA-output-_p_1438.html
Best regards,
Brad