Electronic Whistles for Referees with USB Charging, 3 Tone High Volume Emerge…
Can keep sounding for 4 hours. USB direct charging save the cost of buying batteries. - Sport Electronic Whistle, 3-Tone, 120 dB, Specific Direction. Independent lithium battery were not sold with the product.
ZHT Electronic Whistles for Referees, 3 Tone High Volume Emerg Black
ZHT Electronic Whistles for Referees, 3 Tone High Volume Emerg Black
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.