This is a kind of connector which needs a force to install

Specifications: 1) Number of contacts: 4 - 36 2) Contact spacing: 0.1mm 3) Current rating: 0.5A 4) Voltage rating: 50V DC/AC 5) Contact resistance: 20mΩ max. 6) Insulation resistance: 800mΩ min. 7) Withstanding voltage: 500V AC (rms) 8) Operating temperature: -25 ~ +85oC 9) Thickness: 0.3±0.03mm 10) Materials: a) Contact: phosphor bronze b) Housing: heat resistance plastic UL94 V-0 Packing: Tape and reel package