Ultra-slim Inspection Light Set - Includes Ultra-slim Internal Inspection Light, Dual USB Wall Charger, and USB 2.0 A-Male to A-Female cable 9-foot Extension Cable A cool, bright light that fits into any spaceThis bright, compact light easily slides into any instrument for inspection and repair. It's tough to see inside acoustic instruments, especially with small f-holes. Flashlights are too clumsy to hold while you're working-you need both hands free when doing a tricky internal repair. We found the perfect small light that won't get in your way. Small size and super brightThis 4" LED light is small enough to easily slip through any soundhole or f-hole, and won't generate any damaging heat. Only 1" wide and just 13/32" tall, it fits into guitars, mandolins, ukuleles, violins, even instruments with narrow f-holes with ease. It's simple to use: just tap the end to turn it on and off. With eight super-bright LEDs you’ll easily see cracks, loose braces, and trouble spots instantly. It's powered by a standard USB cable (must be plugged in); we recommend our 9-foot cable for plenty of room to maneuver, and the dual power supply so you can run multiple lights. Light Dimensions: 4" x 1" x 13/32" (101mm x 25mm x 10mm)