| Product | 4G Wireless Router | RLTK421 |
| Ethernet | Wired WAN | 1x WAN/LAN, 10/100 Mbps, IEEE 802.3 compliant, supports automatic MDI/MDIX, 1.5KV network isolation transformer protection |
| Wired LAN | 1x LAN, 10/100 Mbps, compliant with IEEE 802.3, IEEE 802.3u standards, supports automatic MDI/MDIX, 1.5KV network isolation transformer protection |
| Wi-Fi | Wi-Fi Wireless Connection | IEEE802.11b/g/n, 2.4 GHz AP |
| Speed | IEEE 802.11b/g max 54 Mbps, IEEE 802.11n max 150 Mbps |
| Antena | 1x SMA-K |
| Range | 80 m open area, actual range varies according to environmental conditions |
| Cellular | SIM/USIM | 1x (3 V/1.8 V) Standard 2FF SIM, drawer-type SIM card slot |
| Antena | 1x SMA-K |
| DTU | DTU mode | NET, HTTPD, MODBUS |
| Heartbeat/Identity packet | Supports |
| Baud Rate | 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400 |
| Data Bit | 8 |
| Stop Bit | 1, 2 |
| Parity | NONE, ODD, EVEN |
| Connection Type | RS485 |
| SOCKET | 4 sockets, TCPS (only supports socket A), TCPC, UDPS, and UDPC supported |
| Button | Reload | Hardware Reset Button |
| LED | LEDs | Power, Wi-Fi, 2G/3G/4G, Signal Strength, WAN, LAN |
| Temperature | Operating Temperature | -20 ºC – +70 ºC |
| Storage Temperature | -40 ºC – +125 ºC |
| Humidity | Operating Humidity | 5% – 95% |
| Storage Humidity | 1% – 95% |
| Power Supply | DC Voltage | 9 V – 36 V |
| Power Consumption | Average current 270 mA, maximum current 400 mA at 12 VDC supply |