... sound caller for hunting,hunting product,Hunting bird MP3,hunting device 1.Featurehunting devicePower supply with Li-battery or DC5V ... MP3 format file ,perfect voiceSupport maximum 1GByte SD cardhunting device change voice derectly in SD cardsupport the lock, lock ... voice content5Work State LEDWhen play , it turn light, when plug in SD card , it flash once6Digital KeyRemote keys7Remote LEDWhen press ...