5feet long string with 100 led made of high quality thin and flexible copper wire. 4 in spacing between led bulb. IP65 Waterproof - The light string is IP65 waterproof, the flexible copper wire is coated with silver lacquer which makes the whole string water resistant, perfect for both indoor and outdoor without any worry of moisture or weather damage or short circuit.( Only the string lights is waterproof, the battery pack is not waterproof) Safe and Energy Efficient -