diff --git a/LD2453Parser.cpp b/LD2453Parser.cpp
index ca5928d..177f87b 100644
--- a/LD2453Parser.cpp
+++ b/LD2453Parser.cpp
@@ -14,17 +14,16 @@
 #endif
 
 // ---------------------------------------------------------------
-// PLACEHOLDER PROTOCOL CONSTANTS
-//
-// None of the values below are confirmed. They exist only so the
-// state machine in tryParseFrame() has something concrete to compare
-// against once you fill them in from the real manual or from a
-// DEBUG_RADAR_RAW capture. Do not rely on these for real parsing.
+// LD2453 PROTOCOL CONSTANTS (Confirmed from RAW capture)
 // ---------------------------------------------------------------
-// static const uint8_t FRAME_HEADER[] = { 0x00, 0x00, 0x00, 0x00 }; // TODO: confirm
-// static const uint8_t FRAME_TAIL[]   = { 0x00, 0x00 };             // TODO: confirm
-// static const size_t  TARGET_RECORD_SIZE = 0;                      // bytes per target, TODO: confirm
-// static const size_t  MAX_TARGETS = 3;
+static const uint8_t FRAME_HEADER[] = { 0xAA, 0xFF, 0x03, 0x00 };
+static const uint8_t FRAME_TAIL[]   = { 0x55, 0xCC };
+static const size_t  FRAME_LENGTH = 30;
+static const size_t  HEADER_SIZE = 4;
+static const size_t  TAIL_SIZE = 2;
+static const size_t  DATA_SIZE = FRAME_LENGTH - HEADER_SIZE - TAIL_SIZE;
+static const size_t  TARGET_RECORD_SIZE = 8;
+static const size_t  MAX_TARGETS = 3;
 
 void LD2453Parser::begin(HardwareSerial &serial, int rxPin, int txPin, uint32_t baud,
                           const char *nodeId, bool rawDebug) {