CowboyStudio NPT-04 4 Channel Wireless Trigger for External Speelights with 1 Trigger and 2 Receivers (NPT-04+extra receiver) Description Style:NPT-04+extra receiver This set is designed for photographic studio and on-location work to trigger various flash lights. The transmitter is attached on the hot shoe of the camera while the receiver is plugged into the studio flash. Each receiver works with one studio flash. Additional receivers are available to purchase . From the Manufacturer 4 channels to avoid interference The receivers have an on/off switches, and an LED to indicate triggering A standard ¼in screw mount Channel Selector outside the transmitter and the receiver 4 channels with hot shoe connector for external flashes Transmitter Power: 23A 12V battery Receiver Power: 2 AAA Battery (Not included) Maximum Working Distance: 30m (open area, without interference) Max available in distance range: 30M (Open fields, no fraise) Operates on Frequency: 433MHzv Highest responding time up to 1/320s Triggering life: up to 20,000 times Trigger can operate additional NPT-04 receivers (available in our store) Compatible models: Canon SpeedLite 580EX II, 580EX, 550EX, 540EZ, 520EZ, 430EX, 430EZ, 420EX, 420EZ, 380EX; Nikon SpeedLight SB-800, SB-28, SB-27, SB-26, SB-25, SB-24; Olympus FL-50R, FL-50, FL-36R, FL-36; Pentax AF-540 FGZ, AF-360 FGZ, AF-400 FT, AF-240 FT; Sigma EF-530 DG Super, EF-500 DG Super, EF-430; Sunpak Auto 2000DZ, 622 Pro, 433AF, 433D, 383, 355AFm 344D, 333D; Vivitar 285HV, DF-400MZ, DF-340MZ, 2700; Other flash models with a trigger voltage of 12V or lower. Features: One (1) NPT-04 TriggerTwo (2) NPT-04 ReceiversA standard 1/4" screw mount on each receiver Product Details: Product Dimensions: 12 x 2 x 12 inchesItem Weight: 7.5 ouncesShipping Weight: 7.5 ouncesItem model number: NPT-04+extra receiver Payment We accept Paypal payments only. Sales tax may be applied to your purchase as we possess sales tax certificates for all states we collect sales tax in. If your state is one that we charge sales tax in, you will see the sales tax charge at time of checkout before you submit payment. Delivery Expedited shipping is free. Handling time on our orders is normally between 1-2 business days. Your order should reach you within 1-3 business days. We do not ship to AK, HI, PO boxes, or APO addresses. We're not responsible for any incorrect or undeliverable addresses. We only ship to the confirmed Paypal address. We don't accept requests to change shipping addresses post purchase. We do not ship to AK, HI, PO boxes, or APO addresses. We are not responsible for any incorrect or undeliverable addresses. We only ship to the confirmed Paypal address. Please note that manufactures update their packaging from time to time and that the packaging images shown in our product may vary from what you ultimately receive however be assured you are receiving the identical contents you ordered. Return Policy You may return new, unopened items within 30 days of delivery for a refund, and a restocking fee may apply. Return shipping fees are not refundable. Message us for return instructions if you have questions. Support & Feedback We take our reputation seriously, we buy and sell online, so we understand the value of trust. If you are unsatisfied with your order, please contact us and we will work with you to resolve it to your satisfaction. Contact us via eCRATER messaging and we will respond within 1 business day. Our office hours are 8AM-4PM PST Monday-Friday. We thank you for your business!