Comparison Huawei E3531i-1 vs Huawei E3131

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	Huawei E3531i-1	Huawei E3131
	from $32.00 Outdated Product	from $25.56 up to $27.80 Outdated Product
all specs only differences
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Device type	USB modem	USB modem
Connection
Communication generation	2G 3G	2G 3G
Transmission technology	GPRS EDGE W-CDMA HSUPA HSDPA HSPA+	GPRS EDGE W-CDMA HSUPA HSDPA HSPA+
Ports	USB	USB
Features
External antenna connector
Memory card slot	/microSD, before 32 GB/
SIM card slot
General
Dimensions	84x27x10.5 mm	84х27х12 mm
Weight	30 g	30 g
Added to E-Catalog	march 2016	january 2015

External antenna connector

The presence of a connector for an external removable antenna in the modem design. The meaning of all external antennas is described above; here we note that the connector makes it possible to use rather large antennas with the modem, which significantly exceed the capabilities of stock antennas (both internal and external non-removable ones). In addition, the user can choose the antenna at his discretion.