The N911E weighs 170g and measures 120×69 mm, while the N911C weighs 220g and measures 140×90 mm. Both are made from durable ABS material. The N911E features a 5V-08mA polycrystalline silicon solar panel, 6 red flashing LEDs, and a 3.7V-400mAh battery. The N911C has a 5V-120mA polycrystalline silicon solar panel, 8 red flashing LEDs, a 3.7V-1200mAh battery, visibility up to 1000 meters, a 129-decibel alarm that clearly heard from that distance, IP65 waterproofing, a sensing range of 5-8 meters (affected by ambient temperature), and a 125-degree detection angle. Both models offer multiple modes: 24-hour sound and light alarm, 24-hour silent flashing alarm, night sound and light alarm, and night silent flashing alarm. They boast a unique design that’s both stylish and practical, eco-friendly materials, solar charging, energy efficiency, waterproofing, easy operation, bright lights, loud alarms, and reliable anti-theft performance.