bbTalkie completely does away with a push-to-talk button by implementing robust voice detection that works reliably even in noisy environments. It was all designed with cycling in mind, so hands-free operation that stands up to noise is a big plus. This removes the need to involve any sort of external service like SIM cards or internet access to transmit voice. We’ve seen ESP-NOW used to make digital walkie-talkies before, but bbTalkie is a really evolved take on the concept, not least of which due to its hands-free operation. This lets bbTalkie switch between transmit and listen modes automatically and hands-free, without false triggers.