OEM

USB Tester V20 KEWEISI is a universal voltage and current meter for diagnosing charging issues. The device measures voltage in the range 4 - 20 V DC and current up to 3 A. It has a clear, backlit LCD display showing capacity and charging time.

The compact meter lets you check power bank capacity, charger performance, and cable quality. Equipped with a RESET button, it is simple to use and works as soon as it is connected.

USB-A 2.0 4-pin male plug on PCB is a versatile solution for projects with Arduino, ESP32, and Raspberry Pi. The module has pins at the standard 2.54 mm pitch, which simplifies mounting on breadboards. It provides access to the 5V supply line, ground, and data lines. It is ideal for powering your own circuits, prototyping devices, building custom adapters, and repairing cables. Two mounting holes ensure stable mounting in DIY enclosures.

A compact USB-C to USB-A 3.0 adapter for connecting traditional devices to modern ports. With USB OTG and USB 3.0 support, it delivers fast data transfer and efficient charging for mobile devices. The black adapter is only 20 mm long and highly portable. It works well with USB flash drives, mice, keyboards, and gamepads. No driver installation is required; it works with any hardware that supports host mode, offering full versatility for everyday use.

The compact USB-C to USB-C (male-to-male) coupler is a universal solution for modern devices. The adapter has two male plugs and supports the Power Delivery up to 100W standard, providing rapid charging for laptops, tablets, and smartphones. The product enables stable data transfer and high-quality image and video transmission to external monitors. It also allows direct connection of devices equipped with female ports. This versatile accessory combines power, data, and video signal in one.

Voltage-to-PWM converter is a universal module that converts 0-5V or 0-10V signals to PWM 0-100%. Input range selection is via a convenient jumper. The device is ideal for smooth control of DC motors, fans, and pumps. The module is fully compatible with popular microcontrollers such as Arduino, ESP32, and Raspberry Pi. The integrated potentiometer enables precise calibration, and compact dimensions simplify mounting in automation systems and electronics projects.

The compact WeMOS D1 Mini WiFi module with the ESP8266-12F chip is a versatile solution for IoT projects. The board has 4MB Flash memory, a CH340 converter, and a microUSB connector for easy programming in Arduino IDE.

The microcontroller offers a rich set of pins, including 11 GPIO pins, an ADC input, and support for UART, I2C, SPI, and 1-Wire interfaces. The module supports Wi-Fi connectivity, making it an excellent choice for building smart sockets, switches, and home automation systems.

Compact white 0.96 inch OLED display with 128x64 pixel resolution. Equipped with the reliable SSD1306 controller, it supports I2C and SPI interfaces. The module is fully compatible with popular platforms such as Arduino, ESP8266, ESP32, and Raspberry Pi. Powered at 3-5V, it offers high contrast and low power consumption. Ideal for home automation, weather stations, IoT projects, and wearable electronics.

The high-performance WIFI ESP8266 NodeMCU V3 module is an ideal solution for IoT projects and Smart Home systems. The board offers 10 GPIO pins, I2C and 1-Wire support, a microUSB connector, and a built-in PCB antenna. The integrated CH340 converter simplifies programming in Arduino IDE. The device provides stable Wi-Fi 2.4 GHz communication and 4 MB of flash memory. It works well in building automation, weather stations, and wireless sensors.

The set includes 65 colourful male-to-male jumper wires with lengths from 12 cm to 24 cm. The cables have a standard 2.45 mm pitch and are used for quick connection of breadboards and electronic modules without soldering. The jumpers are fully compatible with popular platforms such as Arduino, Raspberry Pi and ESP32. Different colours and lengths make it easy to identify connections and keep things organised when prototyping circuits and creating IoT projects.

This USB-A male adapter with a 4-pin screw terminal lets you build custom USB connections quickly without soldering. Wires attach via screw clamps. It has a detachable terminal block and clearly marked pins. Ideal for prototyping, cable building, and powering circuits. Fully compatible with microcontrollers such as Arduino, ESP8266, ESP32, and Raspberry Pi.

Durable 18650 1S 3.7V battery holder - a reliable way to power electronic circuits. It has factory-installed 15 cm leads and a practical screw mounting hole for stable mounting and fast hook-up.

This compact battery holder is ideal for powering microcontrollers, including Arduino and Raspberry Pi. It works well for custom power modules, power banks, RC models, and standalone LED lighting systems.

The XH-M602 module is a universal battery charging controller powered by 220V. The device automatically manages the charging process by turning the external charger on and off, which effectively protects the cells from overcharging. It supports a wide operating voltage range from 0V to 120V with high precision. The module works with Li-Po, Li-Fe, Li-Ion, and gel batteries. The compact design is ideal for backup power systems and electronics projects using Arduino or Raspberry Pi.

Efficient step-down buck converter with the XL4015 supports input voltage 4 - 38 V and output 1.25 - 35 V. The module enables smooth voltage and current regulation up to 5 A using built-in potentiometers. The device achieves efficiency up to 95% and includes essential thermal protection. The converter is ideal for powering electronic circuits, charging rechargeable batteries, and building workshop power supplies. Input voltage must be at least 1.5 V higher than the output voltage.

High-efficiency buck voltage converter based on the XL4015 IC. The Step-Down module accepts input voltage 5.5 - 36V DC and allows smooth output voltage adjustment in the range 1.25 - 32V DC. Maximum output current is 5A. The device supports CC/CV mode for safe battery charging and LED lighting. The converter offers high efficiency of 95% and built-in short-circuit and thermal protection. Ideal for bench power supplies and microcontroller projects.

A high-performance DC-DC step-down voltage converter based on the XL4016 IC. It allows smooth adjustment of the output voltage from 1.25 V to 35 V with an input of 4 - 38 V. The module offers a maximum power of 200 W, current up to 8 A, and high efficiency of ~90%. It is well suited for powering Arduino, Raspberry Pi, LED systems, and solar panel installations. Precise multi-turn potentiometers ensure full control of operating parameters in a compact package.

Reliable protection for 12V and 24V batteries against deep discharge. The device continuously monitors voltage in the 8-36V range and automatically cuts power when it drops below the set value. It offers precise cutoff voltage and hysteresis adjustment via built-in buttons, plus a clear display. Ideal for photovoltaic systems, campers, emergency backup power, and protecting gel batteries from damage - effectively extending battery life.

ZB2L3 tester is a precise module for measuring capacity of 18650 cells and Li-Ion, Ni-Mh, and Pb batteries. The device is powered by 4.5V - 6V via a micro USB port and supports batteries under test up to 15V. Maximum measured capacity is 9999Ah with 1% accuracy.

The tool works well for verifying recovered cells and diagnosing power packs. The kit includes two 7.5 Ohm 5W load resistors, enabling quick and trouble-free start of accurate discharge tests.