Description (found online):
The HP 1820 Switch Series offers more choice and flexibility for smaller organizations that require ease of use and lower TCO, while delivering better network performance with an enhanced user experience. HP 1820 Switch Series devices are smart-managed, fixed-configuration Gigabit Ethernet Layer 2 switches with basic features in an easy-to-administer solution. The series includes 8-, 24- and 48-port non-PoE and PoE+ Gigabit Ethernet models. Specific models include SFP ports for fiber connectivity. Some models are fanless, making them ideal for office deployments.

Specifications (found online):

Device Type	Switch - 24 ports - Managed
Enclosure Type	Desktop, rack-mountable 1U
Subtype	Gigabit Ethernet
Ports	24 x 10/100/1000 + 2 x Fast Ethernet/Gigabit SFP
Performance	Throughput (64-byte packet size): up to 38.6 Mpps ¦ Switching capacity: 52 Gbps
MAC Address Table Size	8000 entries
Jumbo Frame Support	9220 bytes
Remote Management Protocol	SNMP 1, SNMP 2c, HTTPS
Encryption Algorithm	SSL
Features	Flow control, full duplex capability, Layer 2 switching, DHCP support, BOOTP support, VLAN support, auto-uplink (auto MDI/MDI-X), DoS attack prevention, port mirroring, SNTP support, Quality of Service (QoS), Jumbo Frames support, LLDP support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1Q, IEEE 802.3ab, IEEE 802.1p, IEEE 802.3x, IEEE 802.3ad (LACP), IEEE 802.1ab (LLDP)
Processor	1 x ARM Cortex-A9: 400 MHz
RAM	128 MB SDRAM
Flash Memory	16 MB
Interfaces	24 x 1000Base-T - RJ-45 ¦ 2 x - SFP
Power Device	Internal power supply
Voltage Required	AC 120/230 V (50/60 Hz)
Rack Mounting Kit	Included
MTBF	80 years
Compliant Standards	FCC Class A certified, CISPR 22 Class A, CISPR 24, EN 61000-3-2, EN55022, IEC 61000-3-2, IEC 61000-3-3, IEC 61000-4-11, IEC 61000-4-2, IEC 61000-4-3, IEC 61000-4-4, IEC 61000-4-5, IEC 61000-4-6, IEC 61000-4-8, EN 61000-3-3, EN55024, UL 60950-1, IEC 60950-1, EN 60950-1, EN 60825, CAN/CSA C22.2 No. 60950-1, VCCI Class A
Width	44.25 cm
Depth	24.61 cm
Height	4.39 cm
Weight	2.72 kg
Service & Support	Limited warranty - advance parts replacement - lifetime - response time: next business day
Min Operating Temperature	0 °C
Max Operating Temperature	40 °C
Humidity Range Operating	15 - 95% (non-condensing)
Min Storage Temperature	-40 °C
Max Storage Temperature	70 °C
Humidity Range Storage	15 - 95% (non-condensing)