[Magnetic latching relay, stable and energy-saving] Our smart switch uses a magnetic latching relay, which only needs to input current once to maintain the state. It uses a magnetic field as the driving force and has and high accuracy. After the contacts are closed, they can maintain a stable closed state through magnetic holding force. Even if the current in the coil disappears, the contacts will still remain closed, providing reliable control signals, while also effectively saving energy and reducing the power consumption of the system. This Particularly beneficial for applications with long or frequent work hours. [Partition design, double insurance, ] 1. At the switch wiring area, we have installed a V0 flame-retardant PC circuit isolation board to avoid the intersection of lines and effectively eliminate the problem of short circuits caused by no baffle. 2. We also installed a circuit isolation board between the switch panel and the circuit board to avoid direct contact with the circuit board, which helps protect the equipment, protect your safety, and give you more peace of mind. [2.5D curved tempered glass panel] Elegant appearance, classic colors can better match any home style. The panel is made of 2.5D curved tempered glass, which feels delicate and easy to clean. It is also moisture-proof, allowing it to work in humid conditions, preventing most accidents, making it durable and safe to use. Timing can be set according to personal habits to automatically control the switch, supporting timing, countdown, cycle timing, random timing, and inching timing. For example: you can set the smart switch to turn on the water heater for preheating when you work, so that you can enjoy a comfortable hot bath when you get home, and it will automatically turn off when you sleep, helping us to make rational use of electrical appliances, avoid long-term unnecessary use, and save electricity. [Manual countdown] The countdown can be manually set directly on the switch panel. The data is synchronized with the APP. The adjustment range is 10-90 minutes. The user can adjust it as needed. [Indicator light and fluorescent strip design] The switch indicator light uses red and blue to distinguish the switch status, and a fluorescent strip at the bottom emits a faint reminder, allowing you to easily find the switch position in a hazy environment. [WIFI+Bluetooth dual-mode connection] Turn on Bluetooth on your phone and use the Bluetooth module to automatically search for for quick network configuration and connect to the APP faster. It is about 2 times faster than speed of only WIFI single-mode connection. Relay:20A Power:4000W Voltage:AC110-240V 50/60Hz Type-C output:5V1A Working temperature:-10-60 Wireless frequency:2.4GHz Precautions: 1. Bluetooth is only used for network signal connection and cannot be used alone. WIFI+Bluetooth is more stable. 2. For indoor use only. 3.Type-C is slightly hot when charging, the temperature is about 55C, which is normal, don't worry. Due to different batches, the appearance, color and printed words of the product , which will not affect the use. Colour:B:Black Material:Plastic Size:12x7.2x3.84cm Package Contents: 1 * Water Heater Switch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.