Notice: 1. Remote control copying is only possible with remote controls operating at the same frequency. Please verify the frequency of the remote control you intend to copy before purchase. 2. This remote control cannot copy computer codes or rolling codes. It supports fixed-code copying only. Specifications: Transmission frequency: 433 MHz Channels: 4 Model Number: 433 MHz Duplicate Remote Control Wireless Communication: RF Color: ABCD key layout Functions: Copy remote control, test remote control Working current: 10 mA Radiated power: 10 mW Dimensions: 5.4 × 2.9 × 1.4 cm Weight: 28 g Transmission range: 50–100 m (in open area; receiver sensitivity: -100 dBm) Applications: Suitable for electric retractable doors, elevators, gates, rolling shutter doors, garage doors, sliding doors, LED lights, fireworks igniters, passenger doors, anti-theft alarms, door alarm devices, motorcycle anti-theft alarms, and similar RF-controlled devices. Copying Procedure: 1. Clear Code: Press keys A and B simultaneously (or Lock and Unlock keys, depending on model). After the LED flashes three times, release one key while holding the other. Then press the released key three times. The LED will flash rapidly, indicating all stored codes have been erased. After clearing, pressing any button will not activate the LED. 2. Copy Code: Hold the original remote control in one hand and the duplicate remote control in the other. Place them as close together as possible—ideally side by side on a flat surface. Press the copy button on the duplicate remote. When the LED flashes three times, copying is complete. Repeat for additional buttons. For low-power remotes, place the original remote directly against the duplicate unit during copying. Avoid electrical noise and interference. If copying fails, clear the code and retry. Notes: 1. Always clear existing codes from the duplicate remote before copying new ones. 2. Performing an unlock operation will erase previously copied data. Package Includes: 1 / 2 / 3 / 4 / 5 / 10 pcs 433 MHz remote controls (with keychain) 1 x user manual