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| Name | Bluno | Beetle ESP32 | Beetle BLE | Romeo BLE | Romeo BLE mini | Bluno Nano |
| SKU | DFR0267 | DFR0575 | DFR0339 | DFR0305 | DFR0351 | DFR0296 |
| Microcontroller | ATmega328 | ESP32 | ATmega328 | ATmega328P | ATmega328P | ATmega328P |
| BLE Chip | TI CC2540 | ESP32 | TI CC2540 | TI CC2540 | TI CC2540 | TI CC2540 |
| Power supply interface | USB or DC2.1 | USB | USB | USB | USB | USB |
| USB Powered or External (V) | 7 - 12 | 3.5 - 6.5 | 6 - 8 | 5 - 23 | 6.5 - 10 | 7 - 12 |
| Operating Voltage (V) | 5V | 3.3V | 5V | 5V | 5V | 5V |
| Bootloader | Arduino UNO | Firebeetle ESP32 | Arduino UNO | Arduino UNO | Arduino UNO | Arduino UNO |
| Flash(KB) | 32 | 16M | 32 | 32 | 32 | 32 |
| SRAM(KB) | 2 | 520 | 2 | 2 | 2 | 2 |
| Analog pins | 6 | 4 | 4 | 8 | 8 | 8 |
| Digital pins | 14 | 4 | 4 | 14 | 4 | 12 |
| UART | 1 | 1 | 1 | 1 | 0 | 1 |
| I2C | 1 | 1 | 1 | 3 | 1 | 1 |
| SPI | 1 | 1 | 1 | 1 | 0 | 1 |
| Download Mode | Micro USB, Wireless | Micro USB | Micro USB, Wireless | Micro USB, Wireless | Micro USB, Wireless | Micro USB, Wireless |
| Maximum transmission distance (M) | 30 | 30 | 30 | 70 | 30 | 50 |
| Arduino UNO Compatible | √ | × | √ | √ | × | × |
| Master/slave switch | √ | √ | √ | √ | √ | √ |
| Bluetooth passthrough | √ | √ | √ | √ | √ | √ |
| Bluetooth 4.0 wireless program | × | × | √ | √ | × | √ |
| iBeacons | √ | √ | √ | √ | × | × |
| Bluetooth HID | √ | × | √ | √ | √ | √ |
| App Control | √ | √ | √ | × | √ | √ |
| Dimension(mm) | 75*54 | 35*34 | 28.8*33.1 | 94*80 | 45*38.5 | 53*19 |
| Weight (g) | 50 g | 12 g | 10 g | 62 g | 25 g | 17 g |
| Price($) | $24.9 | $14.9 | $14.9 | $39.5 | $25.9 | $24.9 |
| Key Features | can directly connect with app, no pair need | Integrate a Dual-Core ESP-WROOM-32 module. Support MCU and Wi-Fi &Bluetooth dual-mode communication. V shaped gilded I/O interface, can be sewn on clothes directly. | Mobile BLE APP Connection Support. V shaped gilded I/O interface, can be sewn on clothes directly. | Mobile BLE APP Connection Support. Two way H-bridged Motor Driver with 2A maximum current and wireless socket. | Mobile BLE APP Connection Support. 1.2A single-channel continuous drive current and 3.2A current H-bridge Motor Driver interface. | Can upgrade BLE firmware via USB, integrate with mobile Bluetooth into a star network without pair |
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| Name | Bluno Mega 2560 | Bluno Mega 1280 | Bluno M3 | Bluno M0 | FireBeetle BLE4.1 | FireBeetle ESP32 |
| SKU | DFR0323 | DFR0306 | DFR0329 | DFR0416 | DFR0492 | DFR0478 |
| Microcontroller | Mega2560 | ATmega1280 | STM32 F103RET6 | NUC123ZD4AN0 | ATMEGA328P | ESP32 |
| BLE Chip | TI CC2540 | TI CC2540 | TI CC2540 | TI CC2540 | TI CC2540 | ESP32 |
| Power supply interface | USB or DC2.1 | USB or DC2.1 | USB or DC2.1 | USB or DC2.1 | USB | USB |
| USB Powered or External (V) | 5 - 23 | 5 - 23 | 7 - 12 | 7 - 12 | 3.7 - 5.5 | 3.3 - 5.0 |
| Operating Voltage (V) | 5V | 5V | 3.3V | 5V | 3.3V | 3.3V |
| Bootloader | Arduino Mega2560 | Arduino Mega1280 | Bluno M3 | Bluno M0 | Arduino Pro or Pro Mini | FireBeetle-ESP32 |
| Flash(KB) | 256 | 128 | 512 | 68 | 32 | 16M |
| SRAM(KB) | 8 | 8 | 64 | 20 | 50 | 520 |
| Analog pins | 16 | 16 | 11 | 6 | 6 | 5 |
| Digital pins | 54 | 54 | 39 | 31 | 14 | 10 |
| UART | 4 | 4 | 5 | 1 | 1 | 1 |
| I2C | 2 | 2 | 1 | 1 | 1 | 1 |
| SPI | 1 | 1 | 2 | 1 | 1 | 1 |
| Download Mode | Micro USB, Wireless | Micro USB, Wireless | Micro USB, Wireless | Micro USB, Wireless | Micro USB | Micro USB |
| Maximum transmission distance (M) | 30 | 30 | 30 | 30 | 30 | 50 |
| Arduino UNO Compatible | √ | √ | × | × | × | × |
| Master/slave switch | √ | √ | √ | √ | √ | √ |
| Bluetooth passthrough | √ | √ | √ | √ | √ | √ |
| Bluetooth 4.0 wireless program | √ | √ | √ | √ | √ | × |
| iBeacons | √ | √ | √ | √ | √ | √ |
| Bluetooth HID | √ | × | √ | √ | × | × |
| App Control | √ | √ | √ | √ | √ | √ |
| Dimension(mm) | 100*53 | 100*53 | 68.7*31.3 | 68.5*53.4 | 58*29 | 24*53 |
| Weight (g) | 45 g | 45 g | 30 g | 30 g | 20 g | 24 g |
| Price($) | $29.9 | $19.9 | $29.9 | $24 | $18.9 | $24.9 |
| Key Features | Mobile BLE App Support. Compatible with all Arduino Mega pins. Flash capacity: 256KB (4k for bootloader) | Mobile BLE App Support. Compatible with all Arduino Mega pins. Flash capacity: 128KB (4k for bootloader) | All 39 Digital I/O Pins can enable External Interrupt. 5 Serial Port. | The only ARM Cortex-M0 Arduino Microcontroller that supports 5V standard logic level. IIS interface supply. Wav files play & record support. | Support KISS connection (approach connection). Support Bluetooth 4.1 multiple device cascade (maximum:4) | Integrate a Dual-Core ESP-WROOM-32 module. Support MCU and Wi-Fi &Bluetooth dual-mode communication. |
