Made of high-quality materials, convenient, easy to use and operate, wide application range and long service life. Features: The transmitter has 8 function keys (6 single-speed keys + 1 start key + 1 stop key). The number of transmitter control points can be up to 8. The transmitter has a security key switch to prevent unauthorized use. The transmitter can be connected to the computer through a data cable to set the button function mode. The transmitter has a low battery alarm device that automatically shuts down the circuit when the voltage is insufficient. The nylon fiber shell is comfortable to touch, strong and drop-proof, waterproof, anti-corrosive and insulating. The transmitter and receiver boards have crystal oscillators for stable performance. IP65 protection level, waterproof, dustproof, and drop-proof, and can adapt to different environments. Using wireless antenna technology, the signal is stronger and the power consumption is lower. The external antenna avoids signal shielding by the fuselage. The receiver is equipped with high-quality pure copper cable, 1.3 meters in length and 99.9% pure. The color is bright and clear, and it is equipped with U-shaped terminal blocks for convenient and quick wiring. 360-degree barrier-free remote control, 5.0 remote control system, strong penetration, no aiming required. Specifications: Main material: Glass fiber reinforced nylon Main color: Orange + Black Model: F21-E1B Transmitter: Protection level: IP65 Transmitting power: 10dBm Battery: 2 AA batteries (not included) Code: 32 bits (4.3 billion groups) Temperature: medium temperature Control distance: 100 meters Product size: 165*75*46mm/6.5*3.0*1.8in Product weight: 279g/9.8oz Receiver: Protection level: IP65 Receiving distance: 100 meters Sensitivity: -110dBm Code: 43 Billion code, no Normal temperature: medium temperature Echo capacity: 8A Fully sealed relay input power: DC12-72V Product size: 190*88mm/ 7.5*3, 5in Product weight: 655g / 1.4lb Packing size: 310*210*170mm /12.2*8.3*6.7in 1259g / 2.8 lbs Packing list: 1 * Transmitter 1 * Receiver 1 * Protective case 2 * Fuse