DC 6-12V NE555 Pulse Generator Module Sine/Triangle/Square Wave generator multi-channel Waveform Signal Generator DIY Kit
https://www.vogueparade.com/shopping/EN/1537/1/1005003643224725/dc-6-12v-ne555-pulse-generator-module-sinetrianglesquare-wave-generator-multi-channel-waveform-signal-generator-diy-kit//