Raydio Master SN-2 Professional Bluetooth 4.0 Camera Shutter Release Trigger RDM-ST1 Intervalometer for Nikon D90 , D3100, D3200, D5000, D5100, D5200 Nikon D7000, D7100, D600, P7700# RDM-ST1 is easy to use. Just connect the mini shutter release cable to your camera. Turn on the mobile application and shoot. RDM-ST1 connects to your iPhone, iPad, iPod touch, Samsung S4, Mega, Google Nexus 7 and other android devices by Bluetooth 4.0 protocol. Bluetooth 4.0 is required for your mobile device in order to work with RDM-ST1. RDM-ST1 can control the meter on/auto focus and trigger shutter release by sending signal through the wire. You can send shutter release commands through the mobile application. Once the trigger signal is received from the Bluetooth, RDM-ST1 interpret the signal and trigger the camera's shutter immediately. Thanks to the extremely low power consumption circuit and Bluetooth 4.0 technology, RDM-ST1 can be operated by a CR-2032 coin cell for up to 3 years without the need of replacing battery. RDM-ST1 is the smallest smart phone controlled self powered WIRELESS shutter release trigger ever made. No matter you simply want a wireless shutter for taking a group photo, long exposure photo or time lapse pictures, the intuitive user interface provided by the smart phone or tablet's mobile application can let you get it done easily. RDM-ST1's innovative Smart Scheduler frees up your mobile device after the command is sent to the device. RDM-ST1 will carry out the photo taking task for you even your mobile device is not connected.