Black neck light equipped with 20 LEDs, offering approximately 15 hours of use. I bought it for walking my dog at night, but I rarely walk on dark roads, so it's almost unused. - Brand: Panasonic - Model Name: BF-AF10P-K - Color: Black - Number of LEDs: 20 - Battery Type: CR2032 - Usage Time: Approximately 15 hours - Size: Approximately 75mm x 1mm - Weight: Approximately 40g