Features: Power Source: 6V - requires only 4 AA batteries per receiver. Range: 150 meters. Each receiver includes an antenna. Fully programmable - assign any or all receivers to any button on any system remote. To program the receiver, insert a small stick into the hole on the receiver box. The light will flash; then press the corresponding key on the remote. The receiver will sync with the remote. Expandable - Add additional receivers (sold separately) to increase the number of cues. Interchangeable & Economical: If one receiver malfunctions after extended use, replace it individually. Only the receiver needs replacement; there is no need to purchase a new remote. Specification: Material: Plastic Weight: 265g / 9.3oz Frequency: 433MHz Transmitter Power Source: 12V 23A battery (NOT included) Receiver Power Source: 4 x AA batteries (NOT included) Number of Keys: 12 Range: 150m / 5905.5 inches Package List: 1 x Remote Controller 1 x Receiver 1 Set x Connecting Line Note: 1. Handle the product with care; avoid shaking and dropping. 2. Keep the receiver as far away from fireworks as possible to prevent damage. 3. Remove batteries before storage to prevent corrosion. 4. Do not place the product in damp, acidic, alkaline, or polluted environments. 5. Batteries are not included with any components of this system.