Amazon offers Tractive LED Light Up Dog Collar USB Rechargeable Waterproof for  (reg. $7.31) free shipping with Amazon Prime. 

Product Description:
Light up dog collar for night visibility. Offers 3 dog light modes - slow flash, fast flash and steady. This LED dog collar is USB rechargeable, and can go 2-10 hours on a single 2 hour charge. Waterproof enough for rainy days. Drivers can see the dog collar light from up to 500m away.