4-watt
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Fortune BL-A7 Portable Black Light, 6.5″ Length x 1.6″ Width
$8.87Portable black light can be used to detect invisible ink, find pet stains, or perform similar tasks
Contains 4-watt bulb; emits long-wave ultraviolet light at 365 nanometers
Attached strap can be looped around hand or wrist for carrying