极低功率UHF无线收发器 315/433/868和915MHz ISM/SRD波段系统 AMR-自动仪表读数 电子消费产品 RKE-两路远程无键登录-Very low power UHF wireless transceivers 315/433/868 and 915MHz ISM/SRD band systems AMR-automatic meter reading of consumer electronics products RKE-two-way remote keyles