Features: 

1) 21pcs LED bulbs 

2) Ultra bright LED lights, high intensity LED

3) Extensive lifetime of LED (100,000h)	

4) Water-resistant

5) 3 x AAA batteries 

6) Size: Φ3.7 x 9.5cm

7) Push on/off switch

8) Different surface colors: black, silver, and titanic

9) Different packing available: bubble Bag, white box, color box, or blister card

10) Logo imprinted available or laser engraved

11) Custom designs acceptable