How Zebra PTT Express is licensed
On Zebra mobile terminals with Android OS, the PTT Express client, formerly Workforce Connect PTT Express, is pre-installed. The client provides a simple Push-To-Talk (PTT) voice solution with group call and private response capabilities across a single network subnet. The PTT Express solution uses Wi-Fi infrastructure and requires no servers or PBX integration.
Until Android 8.1 (Oreo), PTT Express was pre-licensed, in other words, no license had to be purchased. For Android 10 and above, every device where PTT Express is used must be licensed. This is a perpetual license, its SKU is WFCPTTE-EXPR-T1-PRD.