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HC-06 Bluetooth Serial Pass-Through Module
Works with any USB Bluetooth adapters.
Default Baud Rate: 9600,8,1,n.
Built in antenna.
Coverage up to 30ft.

Speaker small magnetic speaker 3W 4R 3 W 4 ohm diameter 36MM thick 20MM cone magnetic

13KG 15KG Servos Digital MG995 MG996 Servo Gear for Futaba JR Car RC Model Helicopter Boat

Speaker small magnetic speaker 1W 8R 1 W 8 ohm diameter 66MM thick 12.7MM cone magnetic

SG90 9G Micro Servo Motor Kit for RC Robot Arm Helicopter Airplane Remote Control

Bluetooth master and slave moduleThrough the AT command, you can set this bluetooth module to the master mode can also be set to slave mode, even in iBeacon way work .it also Supports Apple Notification Center Service (ANCS)
base Board 4 PIN, leads to VCC, GND, TX, RX. You can be very convenient to connect to your arduino project or other DIY project
Working voltage 3.6 V to 6V,Default rate of 9600.There are 4PIN dupont cable in the package

Micro SD TF card reader module SPI interface with chip level conversion
Support Micro SD card, Micro SDHC card (high speed card)
board level conversion circuit, namely the interface level for 5V or 3.3V
power supply is 4.5V ~ 5.5V, 3.3V voltage regulator circuit board
The communication interface is a standard SPI interface
M2 screw positioning holes for easy installation

CH340 Serial Port Debugger USB to TTL Converter CH340G module STC Download Cable Adapter Module

5V 2 Channel SSR Solid State Relay Board Power Switch High Level Trigger
Working Voltage: DC 5V
Working Current: 160mA
Input Control Voltage: 0-2.5V(low level,OFF), 3.3-5V(high level, ON)
Compatible Load: AC 100-240V 2A
Module Size: 55 X 33 X 25mm/2.17 X 1.30 X 0.98inch(L*W*H)

5V Relay 1 Channel SSR Low Level Solid State Relay Module 250V 2A

4 Channel 5v Relay Shield Module for Arduino UNO R3

Standard for Shield interfaces and shape
Can continue to stack other for expansion boards
3 M3 screw positioning holes for easy installation
High Drive (5V or 3.3V) normally open contact closure
Onboard relay indicator (red)

1 Channel 5V Relay Module Low level Trigger    1-Channel relay module, with photoelectric isolation    dc or ac signal control, can control 220 v ac load    5v relay, low level trigger