1、This kit includes a transmitter, a receiver and a sync cord, good equipment for photography lovers to achieve wireless control of camera flash 2、Stable frequency ensures reliable and fast signal transmission in 25-30m range, suitable for both indoor and outdoor use 3、With wireless grouping system (16 channels) to satisfy various shooting requirements 4、The hot shoe fully supports various brands of flash, sensitive and triggers quickly without disfunction like strobe, sync speed is up to 1/250s 5、Lightweight and portable, receiver is powered by 2 x AAA batteries, transmitter is powered by built-in battery. With a 1/4'' screw hole on the bottom for easy installation Features: This kit includes a transmitter, a receiver and a sync cord, good equipment for photography lovers to achieve wireless control of camera flash. Stable frequency ensures reliable and fast signal transmission in 25-30m range, suitable for both indoor and outdoor use.  With wireless grouping system (16 channels) to satisfy various shooting requirements. The hot shoe fully supports various brands of flash, sensitive and triggers quickly without disfunction like strobe, sync speed is up to 1/250s.  Lightweight and portable, receiver is powered by 2 x AAA batteries, transmitter is powered by built-in battery. With a 1/4'' screw hole on the bottom for easy installation. Specification: Material: Plastic Color: Black Power Supply: for transmitter-built-in 23A/12V battery(10000times); for receiver-2 x AAA battery (not included)  Working Distance: Outdoor-30m; Indoor-25m Channel: 16 Frequency: 433Mhz Max. Sync Speed: 1/250s Application: for Nikon, Canon, etc Screw Hole: 1/4inch Weight: Approx. 88g Packing List: 1 x Transmitter 1 x Receiver 1 x 2.5mm Sync Cable 1 x Manual Note: The transmitter has built-in battery, which is not rechargeable, once it runs out, you need to change it by yourself.