Over current Protection. OVP: Over Voltage Protection. OTP: Over Temperature Protection. SCP: Short Circuit Protection. Light and portable, this product is easy to carry as a replacement. Light weight. Easy to carry outside and use. Small size ensure high quality performance. AC Adapter for Polk Audio Camden Square Wireless Portable Speaker AM7220-A What You Get: 1 x Replacement charger. AC Adapter for Polk Audio Camden Square Wireless Portable Speaker AM7220-A