PIXEL RW-221 DC2 Wireless Shutter Remote for Nikon D90 D5000 D7000 D3100 RW-221 is Wireless remote control; it has single, continuous, bulb and delay shooting. Different output cable can be connect with different brand camera. The product surface is using high-end stain finish, it's more artistic. Using FSK 2.4 GHz wireless controls system which more reliability and stability. Using AAA battery, it's easy to buy and affordable.