Indoor use only. With 245 joules. Protect your indoor holiday lighting & electrical devices. On/off switch with built-in resettable circuit breaker. 3 ft (0.91 m) 14/3 power cord. UL listed. 245 joules, 15A/120V - 1800 watts. The joule is a measure of heat dissipation. The joule rating indicates the amount of energy a surge protector can handle. The higher the joule rating = the better the performance. Specifications: 1. 2 line protection (line, neutral). 2. Maximum energy dissipation: 245 joules. 3. Maximum surge voltage: 6,000 volts. 4. Maximum spike current: 7,500 amps. 5. Clamping voltages: L-N 700 volts. 6. Response time: less than 1 nanosecond. 7. Nominal discharge current (In) 3KA. 8. MCOV 127 vac. 3 foot 14/3 gauge cord. 6 ground outlet. Flat plug. Made in China.