# BLE max transmit

**URL:** https://community.thunkable.com/t/ble-max-transmit/3446908
**Category:** BLE / BlueTooth
**Tags:** beginner, help
**Created:** [January 3, 2025, 3:19pm UTC](https://community.thunkable.com/t/ble-max-transmit/3446908 "2025-01-03T15:19:09Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![ocorbo](https://avatars.discourse-cdn.com/v4/letter/o/ad7895/32.png) [@ocorbo](https://community.thunkable.com/u/ocorbo)
#### Post date: [January 3, 2025, 3:19pm UTC](https://community.thunkable.com/t/ble-max-transmit/3446908/1 "2025-01-03T15:19:09Z")

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Hello, until now I’ve only been using the ‘Transmit String’ block and by splitting my messages into less than 20 characters, i manage to send larger messages to my microcontroller.I would be interested in trying it with a block like ‘Transmit Byte Array’.

I was wondering, are we limited to transmissions under 20 bytes?  
What flexibility does this block offer that the ‘Transmit String’ block doesn’t offer?  
What are the pros/cons ?

thanks alot 🙂

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### Author: ![ioannis](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/ioannis/32/146956_2.png) [@ioannis](https://community.thunkable.com/u/ioannis)
#### Post date: [January 3, 2025, 6:02pm UTC](https://community.thunkable.com/t/ble-max-transmit/3446908/2 "2025-01-03T18:02:06Z")

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Hello @ocorbo  
As it is mentioned in [our docs](https://docs.thunkable.com/blocks/advanced-app-features/bluetooth-low-energy#outputs-11), all values (string, HEX, Byte array, Base64) are being converted to a byte array before sending.  
The only difference in transmit blocks is the input value.