TW-283 is a type of multi-functional shutter remote control Before operating this Timer Remote Control, please read the User Manual completely and save this manual for future use. Batteries - Please use four new batteries - Please install batteries correctly to the compartment according to the + and - terminal of the batteries. Please refer to your camera manual and connect the Receiver with the correct remote socket of camera. Make sure the cable is inserted to the end for good contact. This shutter control may not be able to fire the camera if the connecting cable is NOT inserted to the correct remote socket or not inserted to the end. Channel - The Transmitter and Receiver must be setted to the same channel. If the number of shots you want to take is less than 99, it is not needed to set Repeat Timer (REPEAT & N2). Please see the images of this product. There are some instructions shown in the images. Specification: System mode: FSK 2.4GHz wireless control system Communication channel: 30 channel Transmission distance: over 260 feet/80m Transmitter Stand-by Time: over 1000hrs. (with 2 pcs AAA batteries) Receiver Stand-by Time: over 400 hrs(with 2 pcs AAA batteries) Transmitter Dimension (LxWxH): 146X40X19mm Receiver Dimension (LxWxH): 73x38x31mm Weight: Transmitter: 52.6g (excluding batteries) Receiver: 36.2g (excluding batteries) Package included: TW-283 Transmitter X 1 TW-283 Receiver X 1 Shutter Connecting Cable X 1 User Manual X 1 (Batteries are no include) Refer to "+" / "-"within the transmitters and receivers battery compartments to insert the batteries. The receiver flash as red LED light;If the light doesnt flash,it should be the battery reversed the direction.