7.5 E-paper BLE Info Card

E-ink bluetooth info card has 2.9 in, 4.2 in, 7.5 in, 10.2 in, 11.6 in five sizes to choose from, with restaurant waiting card, front desk identification card, office door sign, office information card, conference display board, hospital information board, advertising board, display board, information display board and a variety of use functions.