Check for a download link from the seller. Many eBay and Amazon marketplace vendors include a "Digital Manual" link in their order confirmation.
This indicates the batteries are low and need replacement. zn-401s manual
: Manually turn on the specific hardware asset (TV, VCR, or DVD) you wish to sync. Check for a download link from the seller
Even the best devices occasionally malfunction. Here is a zn-401s manual section dedicated to solving common problems. zn-401s manual