... Wireless Data Transceiver, Wireless Data Radio Modem, 433Mhz, 300M-12Km RS-232, RS-485 or TTL Interface Meter Reading,data 2W Wireless Data Transceiver, Wireless ... Data Radio Modem, 433Mhz, 300M-12Km: YS ... meter reading(AMR);* Environment monitor system;*Wireless electronic display screen*Wireless smart terminal: POS, PDA, PTZ;* ...