Souvenir Key finder Find your lost keys just by ... logo can be printed on the thin card Souvenir Key finder For souvenir purpose, this key finder has a card ... alarm, working distance can reach 40 meters above.This souvenir key finder uses wireless RFID technology, which function is ... : -40--70 C;10. Package: blister card, color box, or tin box. Card sizeKeychain size Color: red, blue, pink, grey, ...