• Model number: K12 Mini Audio Microphone Speaker
• BT version: 5.0
• BT distance: 10m

K12 Mini Audio Microphone Bluetooth Speaker offers a compact yet powerful audio experience with its unique crack appearance and vibrant LED lights. This versatile wireless Bluetooth speaker supports BT 5.0, U disks, TF cards, and audio inputs, ensuring seamless connectivity and rich sound. With adjustable volume and song control, it’s perfect for outdoor gatherings and family fun. Enjoy up to 5 hours of playtime with quick charging and a stylish design.

Bluetooth 5.1: This portable Bluetooth speaker with a wireless microphone for adults has built-in Bluetooth 5.1 and can work within 32 feet. It can provide a more stable connection for all Bluetooth devices, and you can use it without worrying about sudden signal cuts.

Strong Sound Penetration: This Bluetooth speaker adopts advanced MP3 audio decoding technology, ensuring clear and strong sound quality. This wireless speaker is equipped with a high-reduction electro-acoustic system and features an LED light show.

Convenient and Lightweight: This kids’ karaoke machine is so lightweight that it’s suitable for children to sing songs. The speaker will prompt a tone, indicating the connection is successful, and the blue light will continue. If the device is not connected, the blue indicator will blink. Once paired, you can press the Short Press Play to play or pause the music.

Ideal Gift: This wireless speaker has many practical functions, making it perfect for KTV singing, gathering singing, family singing, travel, party, speech, class, etc. Put it in an exquisite gift box and then give it to your friends or family as a gift. This Bluetooth speaker will give your friends or family a wonderful singing experience at indoor or outdoor parties！

Products Guarantee: This wireless speaker with 5W loud stereo sound enjoys our 12-month warranty and friendly customer service. The package includes a karaoke machine, a wireless hand-held microphone, and a user manual. If there are any problems with our products, please contact us anytime, and we will be very glad to solve the problem for you.

K12 Mini Audio Microphone Speaker Features:

• Unique crack appearance, LED colorful lights, Bluetooth speaker. Fashionable and creative appearance design.
• BT wireless transmission.
• It supports U disk, TF card, and audio input.
• Support volume adjustment, switch up and down songs
• Can be connected to a computer, mobile phone, MP3, etc. (Need to purchase separately 2 1 cable to connect to a computer)
• Small body drive, large capacity, large volume, treble solid

K12 Mini Audio Microphone Speaker Specifications:

• Model number: K12 Mini Audio Microphone Karaoke Family Wireless Bluetooth Outdoor Speaker
• BT version: 5.0
• Battery: Speaker: 1200mah/3.7V; Microphone: 500mah
• Playtime: 4-5H (the volume will affect the playing time)
• Charging time: 1-2H
• Mode of operation: press key
• Size: speaker: 462g, microphone: 88.5g
• Carton: 45pcs, 38*38*42cm, 25kg (for one mic)
• Product Size: 155*155*75mm
• BT distance: 10m
• Support for implementation: BT / U disk / TF card / audio output
• Material: ABS plastic + plating

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Suit for:JJRC H8C DFD F183 F182 F181 quadcopter

Easy to install

Size: 20mm x 8mm

Weight: 5g/piece

Package Include:

4 x H8C motor (2 pcs CW motor + 2 pcs CCW motor)

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• capacity 5kg-10lb 12oz (50g-1oz)
• capacity 3kg-6lb 8oz (25g-1oz)
• Heavy Plastic Body
• 100% Accuracy
• Analog Display

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• capacity 25kg-10lb 12oz (50g-1oz)
• 39inch/100cm Measuring tape
• Heavy Plastic Body
• 100% Accuracy
• Analog Display

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• Item Type:Switches
• Material:Plastic
• Features:With handle mouse switch
• Warranty:0
• Certification:RoHS
• Model Number:With handle mouse switch
• Switch Type:Micro Switch

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• Automatically manage the working of solar panel and battery in solar system.
• Overloading and short-circuit protection.
• Build-in short-circuit protection, open-circuit protection, reverse protection, over-load protection.
• Protection from lightning strike.
• Prolong the battery life cycle and keep the load work well.
• Easy to set up and operate.
• Suitable for small solar energy system.

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• Dimension: 78*44mm
• Impedance: 4 ohm
• Rated Power: 15w
• Frequency Reponse range: FO-6KHz
• Frequency Response: 0.09+/-20%
• Directivity: Omni directional
• Sensitivity: 84dB+/-3 (dB/W)
• Harmonic distortion: 7 (TMD%)

Connect Bluetooth module to the amplifier

Bluetooth module has four output pins, namely, Lout, Rout, Vcc and GND. Right channel (Rout) and left channel (Lout) are connected to pins 2 and 7 of IC2, respectively, followed by presets VR1 and VR2, and capacitors C3 and C5. Pins 3 and 6 of IC2 are connected to feedback capacitors C4 and C6, which are grounded. Bluetooth module is given a power supply of 5V DC .

Connect amplifier to speakers

Output pins 11 and 12 of amplifier IC2 are directly connected to a loudspeaker (LS2). Similar configuration is done with output pins 15 and 16 of IC2 and another loudspeaker (LS1). A capacitor in series with a resistor is connected to each wire for preventing audio signal oscillation.

The parts of a speaker are:

• The cone and the dust cap (the parts that move air and produce sound)
• The spider and the surround (also called the suspension, these are the parts that hold the cone in place while still allowing them to move)
• The magnet and the voice coil (the parts that interact to convert electric energy into motion)
• The basket
• The pole and top plate
• And finally the frame that mounts everything together

How do speakers work?

Speakers work by converting electrical energy into mechanical energy (motion).  The mechanical energy compresses air and converts the motion into sound energy or sound pressure level (SPL).

When an electric current is sent through a coil of wire, it induces a magnetic field.

In speakers, a current is sent through the voice coil which produces an electric field that interacts with the magnetic field of the permanent magnet attached to the speaker.

Like charges repel each other and different charges attract.  As an audio signal is sent through the voice coil and the musical waveform moves up and down, the voice coil is attracted and repelled by the permanent magnet.

This makes the cone that the voice coil is attached to move back and forth. The back and forth motion creates pressure waves in the air that we perceive as sound.

15w Speaker

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