Wireless Shutter Remote Control JJC Remote Shutter Release Controller for Nikon D3100 D3200 D3300 D5000 D5100 D5200 D5300 D5500 D5600 D7000 D7100 D7200 D7500 D750 D610 D600 D90 Df P7800 P7700 (Amazon Affiliate)
US: https://amzlink.to/az0WFINQKxifJ
Nikon D3100 (and other Nikon DSLRs) Camera Wireless Shutter Remote