Rated Power : 0.25W ; Resistance : 8 Ohm; Diameter : 29mm/1.31"; Hight: 9mm/0.35"; Shape: Round. | The 0.25W speaker component has Unique design, adopted well-performed magnet, imported rubber coil. | This 8ohm speaker is a high quality speaker as a replacement for your sound system, and high sensitivity, loud voice, good and clear sound quality. Adequate volume, it will be your best choice if you have a good application. | Small magnet speaker will be your best choice in DIY speakers and It will work well for home audio-visual equipment and other speakers, it will be your best choice if you have an ideal application. | DIY Magnetic Speaker 0.25W 8 Ohm 29mm Diameter Round Shape Replacement Loudspeaker

Works with any USB Bluetooth adapters, running in slave role: Pair with BT dongle. Led indicate Bluetooth connection status, flashing Bluetooth connectivity, lit the Bluetooth connection and open a port Backplane | Core module uses HC-06, leads from the module interface includes VCC, GND, TXD, RXD, reserve LED status output pin, the microcontroller can be judged by the foot state Bluetooth has connected KEY pin slave invalid. | Small size, low power consumption,high sensitivity for send and receive. Bluetooth version: V2.0+EDR &Operating voltage: 3.3V &Host Interface:UART &Storage Temperature:-40℃~+150℃&Signal coverage: 30ft &Item size: 4.3 * 1.6 * 0.7cm &Item weight: 3g. | HC-06 Bluetooth Serial Pass-Through Module Wireless Serial Communication Compatible for Arduino | The module is mainly used for short-range data wireless transmission,such as Bluetooth wireless data transmission,Industrial remote control, telemetry,Traffic, underground positioning, alarm,Smart home ect.

TTL to RS485 485 to Serial UART Adapter | Has RXD, TXD signal indicator light, monitor send and receive status. | Compatible with 3.3V and 5.0V power supply. | Support multi-machine communication, allowing access at up to 128 devices on the bus | The module can be hot swapped, the signal does not appear dead phenomenon.

Frequency: 3500Hz; Maximum Power: 130W | Circuit Filter Characteristics: Bass 12 dB/oct, Treble 12 dB/oct; Product Name: Crossover Filters Frequency Divider | Rated Power: 100W | 130W 2-Way Speaker System Audio Crossover Filters Frequency Distributor | Dimension: 8.5 x 6 x 2cm/ 3.3 x 2.4 x 0.8 inches(L*W*H); Package Content: 2 x Crossover Filters Frequency Divider

Applications: Home Audio 5.1 bass, bass DIY，Car audio bass, bass DIY | Power: 200W (applicable to 4-inch to 8-inch subwoofer). | Speaker Impedance: 4-8 ohms. | Low Pass Speaker Bass Subwoofer Crossover Filter for 8 Ohm or 4 Ohm | Pure Bass Subwoofer Second-order Crossover Frequency Divider

400W Ajustable Treble / Bass Frequency Divider Distributor 2-Way Speaker Audio Crossover Filters | Large capacity, reasonable design, beautiful appearance, quality achieve full self control. | Inductance adopts anaerobic copper winding , and pure copper wire. | The crossover soprano + available bass binary frequency sound box, can also be used in 2.1 the high small satellite box and automotive loudspeakers. | Implementing overall debugging, no welding, using very convenient, and listening to the sound effects can implement debugging control according to their own interests.

400W Ajustable Treble / Bass Frequency Divider Distributor 2-Way Speaker Audio Crossover Filters | Large capacity, reasonable design, beautiful appearance, quality achieve full self control. | Inductance adopts anaerobic copper winding , and pure copper wire. | The crossover soprano + available bass binary frequency sound box, can also be used in 2.1 the high small satellite box and automotive loudspeakers. | Implementing overall debugging, no welding, using very convenient, and listening to the sound effects can implement debugging control according to their own interests.

Series: HiFI , 2 way 2 Unit (Woofer and Tweeter) | Crossover Frequency: 3200Hz; Maximum Power: 400W; Resistance: 4-16 Ohm | Size:70*57*26 mm / 2.76*2.24*1.02 in | T == Treble; W == Subwoofer; IN == Amplifier | This is a professional frequency divider, which is widely installed in the speaker. Playing an important role of the total frequency signal segmentation

Series: HiFI , 2 way 2 Unit (Woofer and Tweeter) | Crossover Frequency: 3200Hz; Maximum Power: 400W; Resistance: 4-16 Ohm | Size:70*57*26 mm / 2.76*2.24*1.02 in | T == Treble; W == Subwoofer; IN == Amplifier | This is a professional frequency divider, which is widely installed in the speaker. Playing an important role of the total frequency signal segmentation

4Ohm 5W Full Range Audio Speaker Stereo Woofer Loudspeaker | Rated Impedance: 4 Ohm | It will work well for home audio-visual equipment and other HiFi speakers. | Rated Power: 5W | Package includes: 4 x 4Ohm 5W Full Range Audio Speaker

Works with any USB Bluetooth adapters, running in slave role: Pair with BT dongle. Led indicate Bluetooth connection status, flashing Bluetooth connectivity, lit the Bluetooth connection and open a port Backplane | Core module uses HC-06, leads from the module interface includes VCC, GND, TXD, RXD, reserve LED status output pin, the microcontroller can be judged by the foot state Bluetooth has connected KEY pin slave invalid. | Small size, low power consumption,high sensitivity for send and receive. Bluetooth version: V2.0+EDR &Operating voltage: 3.3V &Host Interface:UART &Storage Temperature:-40℃~+150℃&Signal coverage: 30ft &Item size: 4.3 * 1.6 * 0.7cm &Item weight: 3g. | HC-06 Bluetooth Serial Pass-Through Module Wireless Serial Communication Compatible for Arduino | The module is mainly used for short-range data wireless transmission,such as Bluetooth wireless data transmission,Industrial remote control, telemetry,Traffic, underground positioning, alarm,Smart home ect.

Mini speaker 8ohm 3w sound cavity adopts high-end built-in magnetic speakers, stable performance, tight sealing, convenient and reliable, clear sound, providing a long time service for you! | Applications: for Arduino; Robot; for Raspberry Pi; Advertising Machine; Game Machine; Integrated Machine Special Speaker | With JST-PH2.0 2PIN terminal interface, 3w speaker is easy to connect with other modules. Its rated Power: 3 Watt; Impedance: 8 Ohms; wire length: 480mm. | Shape: Rectangle; Diaphragm material: non-paper; Magnetic circuit form: internal magnetic | Micro speaker 8ohm 3w has wide range of applications. It is compatible with raspberry pi, robot, advertising machine, game machine, integrated machine special speaker, etc.

4Ohm 5W Full Range Audio Speaker Stereo Woofer Loudspeaker | Rated Impedance: 4 Ohm | It will work well for home audio-visual equipment and other HiFi speakers. | Rated Power: 5W | Package includes: 4 x 4Ohm 5W Full Range Audio Speaker

Designed with ultra-low power technology, it offers the full range of performance and features of the ESP32 chip. The pin arrangement provides compatibility with the modules developed for the D1 Mini ESP8266 while also offering fast WLAN, enhanced GPIO, Bluetooth functionality, and with its higher performance, a wider range of applications. | MH-ET LIVE D1 mini ESP32 ESP-32 WiFi+Bluetooth Interne | 100% compatible with Arudino IDE, Lua and Micropython, it shows robustness, versatility, and reliability in a wide variety of applications and power scenarios. | All I/O pins have interrupt, PWM, I2C and one-wire capability, except the pin DO. | D1 Mini NodeMCU ESP32 ESP-WROOM-32 WLAN WiFi Bluetooth IoT Development Board 5V Compatible with Arduino

1.Use the CSR BC417 mainstream bluetooth chip, bluetooth V2.0 SPP protocol standards | 2.Module working voltage 3.6 V to 6V | 3.HC-05 Wireless BT Module: with this HC 05 Bluetooth module,You can quickly add the Bluetooth feature to your for Arduino project, and then you can use your android phone to control some gadgets, such as: switch, LED. | 4.6 PIN Dopunt Cable : with this Dupont Cable, you can easily connect this HC-05 Bluetooth module to your for Arduino Board | 5.Can be switched via AT commands as master or slave mode , the device can be connected via AT commands specified