Update timercam.md

docs/en/unit/timercam.md

@@ -175,7 +175,7 @@ In sleep mode, the current consumption of the whole machine is only 2μA. After
 
 <script>
 
-   var purchase_link = '';
+   var purchase_link = 'https://m5stack.com/collections/m5stack-new-arrival/products/esp32-psram-timer-camera-ov3660';
 
    var quickstart_link = 'https://docs.m5stack.com/#/en/quick_start/timer_cam/quick_start_list';