--- product_id: 404643401 title: "HiLetgo 2pcs CC2540 CC2541 AT-09 Serial Wireless Module BLE 4.0 Bluetooth Module Compatible HM-10" brand: "hiletgo" price: "991103β‚«" currency: VND in_stock: true reviews_count: 5 url: https://www.desertcart.vn/products/404643401-hiletgo-2pcs-cc2540-cc2541-at-09-serial-wireless-module-ble store_origin: VN region: Vietnam --- # 256Kb Config Space UART Interface AT Command Support HiLetgo 2pcs CC2540 CC2541 AT-09 Serial Wireless Module BLE 4.0 Bluetooth Module Compatible HM-10 **Brand:** hiletgo **Price:** 991103β‚« **Availability:** βœ… In Stock ## Summary > πŸ”Œ Connect with Confidence! ## Quick Answers - **What is this?** HiLetgo 2pcs CC2540 CC2541 AT-09 Serial Wireless Module BLE 4.0 Bluetooth Module Compatible HM-10 by hiletgo - **How much does it cost?** 991103β‚« with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/404643401-hiletgo-2pcs-cc2540-cc2541-at-09-serial-wireless-module-ble) ## Best For - hiletgo enthusiasts ## Why This Product - Trusted hiletgo brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Compact Design:** Lightweight and space-efficient, perfect for modern tech projects. - β€’ **Power Flexibility:** Operates on both 3.3V and 5V power supplies for versatile applications. - β€’ **Robust Connectivity:** Utilizes the CC2541 chip for reliable BLE 4.0 performance. - β€’ **Protocol Compatibility:** Supports SPP Bluetooth serial port protocol for effortless integration. - β€’ **Seamless Customization:** Easily modify baud rates, device names, and pairing passwords with AT commands. ## Overview The HiLetgo 2pcs CC2540 CC2541 AT-09 Serial Wireless Module is a versatile Bluetooth 4.0 module that supports AT commands for easy customization. With a robust CC2541 chip, it offers 256Kb of configuration space and operates on both 3.3V and 5V power supplies. This module is compatible with the HM-10 and supports UART interface and SPP Bluetooth serial port protocol, making it ideal for a wide range of applications. ## Description HiLetgo 2pcs CC2540 CC2541 AT-09 Serial Wireless Module BLE 4.0 Bluetooth Module Compatible HM-10 ## Features - Support AT command, users can change the serial port baud rate, device name, pairing password and other parameters as needed, use flexible. - It adopts CC2541 chip of American TI Company, configures 256Kb space, and follows V4.0 BLE Bluetooth specification. - Input voltage: 3.3V/5V only needs a set of power supply. - This module supports UART interface and supports SPP Bluetooth serial port protocol. - Compatible HM-10 ## Product Details - **Brand:** HiLetgo - **Hardware Interface:** Bluetooth - **Color:** multicolor - **Compatible Devices:** Desktop - **Data Link Protocol:** Bluetooth - **Item Weight:** 0.02 Kilograms - **Manufacturer:** HiLetgo ## Images ![HiLetgo 2pcs CC2540 CC2541 AT-09 Serial Wireless Module BLE 4.0 Bluetooth Module Compatible HM-10 - Image 1](https://m.media-amazon.com/images/I/61vKZjfcnqL.jpg) ## Customer Reviews ### ⭐ NEGATIVE reviews of this product are being REMOVED *by T***R on Reviewed in the United States πŸ‡ΊπŸ‡Έ on 9 May 2020* I have clearly and politely articulated why I (an experienced Bluetooth-er and user of these products) have critical issues with this particular product. Both times those reviews were REMOVED by Amazon. I'm sorry but if AT commands work except for certain critical ones like AT+ROLE (to set Central-Peripheral (master-slave)) this is not HM-10 compatible. Amazon is in a tough spot because I'm sure they don't know who to believe. But what ever. This will probably be the last time I try to warn you folks. ### ⭐⭐⭐⭐ It's a challenge! *by D***. on Reviewed in the United States πŸ‡ΊπŸ‡Έ on 20 March 2020* Update! I bought two of these to connect two arduino's together wirelessly and I've got them working. Both of these AT-09 bluetooth modules work fine in slave mode, but it took me a while to get one set up as master. It's challenging because there is no documentation that I have found for exactly this module and the AT commands are different than the ones I found online. It's like a puzzle where you have to guess what the pieces are -- fun right! The magic AT commands are AT+Role11 to switch to master, AT+INQ? to find the slave address, and AT+CONN11 to connect to it. I don't know why you need the extra 1s at the end but that seem to get it to work. Cheers! ### ⭐⭐⭐⭐ Worked for my project. Don't use "?" character when entering AT commands. *by L***S on Reviewed in the United States πŸ‡ΊπŸ‡Έ on 5 January 2021* Just a heads up, this is a clone of the HM-10, so some of the information you find online regarding the HM-10 will slightly differ. Also, Let me save you the headache of figuring out the AT commands with this module, don't use the "?" character when entering the AT commands. That's it. Otherwise, you'll get an error when trying to enter something like, "AT+ROLE?". I've included a picture of the available AT commands the module writes when entering "AT+HELP." --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vn/products/404643401-hiletgo-2pcs-cc2540-cc2541-at-09-serial-wireless-module-ble](https://www.desertcart.vn/products/404643401-hiletgo-2pcs-cc2540-cc2541-at-09-serial-wireless-module-ble) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-04-25*