This is B9 the most compact and poweful black light for disc golf players. 

• 3 AAA Standard Alkiline Battery(Not Included), Rechargeable battery is not recommended!
• 9 UV LEDs allow to cover a larger area. Emits 390 to 395 nanometer wavelength.
• Perfect for outside use such as finding scorpions and minerals!
• Improper usage of batteries or using poor quality of batteries could cause hazard issue to your safety. We recommend to use reliable quality batteries.