Usage Tips:Wireless fireworks firing system with 12 channels remote control Feature 1Power Source: 6V - requires only 4 AA batteries per receiver. 2Range:150meters. Each receiver with the antenna. 3Fully programmable - make any or all receivers to any button on any system remote. If you want to programmer the receiver, please put in a small stick on the hole which is on the receiver box. And then the light on the receiver box will be flash-then pre 4Expandable - Add other receivers (available individually) to expand number of cues. 5Interchangeable & Economical: If one receiver has a little problem after used for a period, you could use others instead. Or you just need to buy the receiver, no need to buy the remote. Specification: Material: Plastic Weight: 265g/9.3oz Frequency: 433MHz Transmitter Power Source: 12v 23A battery (NOT included) Receiver Power Source: 4*AA batteries (NOT included) Channel Quantity: 8pcs Range:150m/5905.5inch Package List:: 1 *Remote Controller 2 *Receiver 1 Set *Connecting LineNote: 1. Handle your product with care avoid shaking and dropping it. 2. Keep the receiver as far away from your fireworks as possible to avoid damage. 3. Please remove batteries before storage, for prevent defile incept box. 4. Please do not place the product in the damp, sour, alkali and pollution environment. 5. All the systems are NOT including batteries.6.Please Note: that the type and old type of this product will be sent randomly, and make sure you will not mind before ordering.