
"Calumping" or "through" voltage is a measure of how large a voltage surge can penetrate to your device. Normally this is 120 volts without a peak. The purpose of a surge protector is to prevent voltage spikes well in excess of this value from reaching your equipment. The company doesn't list the clamp/through voltage, but when asked it said it was 750 volts. It won't protect anything.

Tripp Lite TLP1008TEL 10 Outlet Surge Protector Power Strip with 8ft Cord, Tel/DSL Protection, RJ11 and $150,000 Insurance - Silver
12 Review

Extender Xiaomi Mi Power Strip 3, XMCXB01QM, 3 sockets, 10A / 2500 W black 1.8 m
20 Review

Extender Xiaomi Mi Power Strip 3, XMCXB01QM, 3 sockets, 10A / 2500 W white 1.8 m
26 Review

4 Outlet Power Strip with 3 USB Charger Ports and 5ft Braided Cord π‘ - Flat Plug, Wall Mountable Desktop Charging Station for Home, Office, and Cruise Ship use.
12 Review

Allocacoc PowerCube ExtendedUSB, 4 Outlets, 2 USB Ports, 5 ft Cable, Mounting Dock, Surge Protection, Childproof Sockets, ETL Certified - Blue
12 Review

π» Tupavco TP302 Ethernet Surge Protector (2 Pack) with PoE+ Gigabit and Gas Discharge Tube for Full Protection - RJ45 Lightning Suppressor - Mounting Flange - Ideal for LAN Network CAT5/CAT6 - Thunder Arrestor - GbE 1000 Mbps.
11 Review

Power Strip Tower with 14 Outlets, 4 USB Slots, and 6ft Cord - Universal Charging Station by Lovin Product (1-Pack)
11 Review

Fellowes 10-Outlet Metal Split Surge Protector - 1,250 Joules, 6ft Cord in Black and Silver
12 Review