Electronic Whistles for Referees with USB Charging, 3 Tone High Volume
Can keep sounding for 4 hours. USB direct charging save the cost of buying batteries. Independent lithium battery were not sold with the product.
ZHT Electronic Whistles for Referees with USB 5.63 x 2.32 x 1.54 inche, Black
Publisher: ZHT. can keep sounding for 4 hours. USB direct charging save the cost of buying batteries. Independent lithium battery were not sold with the product.
ZHT Electronic Whistles for Referees with USB Charging, 3 Tone High Two Black
Can keep sounding for 4 hours. USB direct charging save the cost of buying batteries. Independent lithium battery were not sold with the product. Color: Two Black.