diff --git a/CHANGELOG.md b/CHANGELOG.md
index cf5ba23..802b356 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.1.1 (unreleased)
+
+- Added binary representation for `vector` type
+
 ## 0.1.0 (2021-04-20)
 
 - First release
diff --git a/Makefile b/Makefile
index d4d1422..a5323a8 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,11 @@
 EXTENSION = vector
-DATA = vector--0.1.0.sql
+DATA = vector--0.1.1.sql vector--0.1.0-0.1.1.sql
 MODULE_big = vector
 OBJS = src/ivfbuild.o src/ivfflat.o src/ivfinsert.o src/ivfkmeans.o src/ivfscan.o src/ivfutils.o src/ivfvacuum.o src/vector.o
 
 TESTS = $(wildcard sql/*.sql)
 
-REGRESS = btree cast functions ivfflat_cosine ivfflat_ip ivfflat_l2 ivfflat_unlogged vector
+REGRESS = btree cast copy functions ivfflat_cosine ivfflat_ip ivfflat_l2 ivfflat_unlogged vector
 
 PG_CONFIG ?= pg_config
 PGXS := $(shell $(PG_CONFIG) --pgxs)
diff --git a/expected/copy.out b/expected/copy.out
new file mode 100644
index 0000000..4c55fa3
--- /dev/null
+++ b/expected/copy.out
@@ -0,0 +1,18 @@
+SET client_min_messages = warning;
+CREATE EXTENSION IF NOT EXISTS vector;
+CREATE TABLE t (val vector(3));
+INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
+CREATE TABLE t2 (val vector(3));
+\copy t TO '/tmp/data.bin' WITH (FORMAT binary)
+\copy t2 FROM '/tmp/data.bin' WITH (FORMAT binary)
+SELECT * FROM t2 ORDER BY val;
+   val   
+---------
+ [0,0,0]
+ [1,1,1]
+ [1,2,3]
+ 
+(4 rows)
+
+DROP TABLE t;
+DROP TABLE t2;
diff --git a/sql/copy.sql b/sql/copy.sql
new file mode 100644
index 0000000..c884fa5
--- /dev/null
+++ b/sql/copy.sql
@@ -0,0 +1,15 @@
+SET client_min_messages = warning;
+CREATE EXTENSION IF NOT EXISTS vector;
+
+CREATE TABLE t (val vector(3));
+INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
+
+CREATE TABLE t2 (val vector(3));
+
+\copy t TO '/tmp/data.bin' WITH (FORMAT binary)
+\copy t2 FROM '/tmp/data.bin' WITH (FORMAT binary)
+
+SELECT * FROM t2 ORDER BY val;
+
+DROP TABLE t;
+DROP TABLE t2;
diff --git a/src/vector.c b/src/vector.c
index fcdfcc3..50434f5 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -6,6 +6,7 @@
 #include "fmgr.h"
 #include "catalog/pg_type.h"
 #include "lib/stringinfo.h"
+#include "libpq/pqformat.h"
 #include "utils/array.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"
@@ -40,6 +41,21 @@ CheckExpectedDim(int32 typmod, int dim)
 				 errmsg("expected %d dimensions, not %d", typmod, dim)));
 }
 
+
+static inline void
+CheckDim(int dim)
+{
+	if (dim < 1)
+		ereport(ERROR,
+				(errcode(ERRCODE_DATA_EXCEPTION),
+				 errmsg("vector must have at least 1 dimension")));
+
+	if (dim > VECTOR_MAX_DIM)
+		ereport(ERROR,
+				(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
+				 errmsg("vector cannot have more than %d dimensions", VECTOR_MAX_DIM)));
+}
+
 /*
  * Ensure finite elements
  */
@@ -217,6 +233,53 @@ vector_typmod_in(PG_FUNCTION_ARGS)
 	PG_RETURN_INT32(*tl);
 }
 
+/*
+ * Convert external binary representation to internal representation
+ */
+PG_FUNCTION_INFO_V1(vector_recv);
+Datum
+vector_recv(PG_FUNCTION_ARGS)
+{
+	StringInfo	buf = (StringInfo) PG_GETARG_POINTER(0);
+	int32		typmod = PG_GETARG_INT32(2);
+	Vector	   *result;
+	int16		dim;
+	int16		unused;
+	int			i;
+
+	dim = pq_getmsgint(buf, sizeof(int16));
+	unused = pq_getmsgint(buf, sizeof(int16));
+
+	CheckDim(dim);
+	CheckExpectedDim(typmod, dim);
+
+	result = InitVector(dim);
+	for (i = 0; i < dim; i++)
+		result->x[i] = pq_getmsgfloat4(buf);
+
+	PG_RETURN_POINTER(result);
+}
+
+/*
+ * Convert internal representation to the external binary representation
+ */
+PG_FUNCTION_INFO_V1(vector_send);
+Datum
+vector_send(PG_FUNCTION_ARGS)
+{
+	Vector	   *vec = PG_GETARG_VECTOR_P(0);
+	StringInfoData buf;
+	int			i;
+
+	pq_begintypsend(&buf);
+	pq_sendint16(&buf, vec->dim);
+	pq_sendint16(&buf, vec->unused);
+	for (i = 0; i < vec->dim; i++)
+		pq_sendfloat4(&buf, vec->x[i]);
+
+	PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
+}
+
 /*
  * Convert vector to vector
  */
@@ -259,17 +322,7 @@ array_to_vector(PG_FUNCTION_ARGS)
 	deconstruct_array(array, ARR_ELEMTYPE(array), typlen, typbyval, typalign, &elemsp, &nullsp, &nelemsp);
 
 	if (typmod == -1)
-	{
-		if (nelemsp < 1)
-			ereport(ERROR,
-					(errcode(ERRCODE_DATA_EXCEPTION),
-					 errmsg("vector must have at least 1 dimension")));
-
-		if (nelemsp > VECTOR_MAX_DIM)
-			ereport(ERROR,
-					(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
-					 errmsg("vector cannot have more than %d dimensions", VECTOR_MAX_DIM)));
-	}
+		CheckDim(nelemsp);
 	else
 		CheckExpectedDim(typmod, nelemsp);
 
diff --git a/vector--0.1.0-0.1.1.sql b/vector--0.1.0-0.1.1.sql
new file mode 100644
index 0000000..79e0074
--- /dev/null
+++ b/vector--0.1.0-0.1.1.sql
@@ -0,0 +1,10 @@
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "ALTER EXTENSION vector UPDATE TO '0.1.1'" to load this file. \quit
+
+CREATE FUNCTION vector_recv(internal, oid, integer) RETURNS vector
+	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT;
+
+CREATE FUNCTION vector_send(vector) RETURNS bytea
+	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT;
+
+ALTER TYPE vector SET ( RECEIVE = vector_recv, SEND = vector_send );
diff --git a/vector--0.1.0.sql b/vector--0.1.1.sql
similarity index 95%
rename from vector--0.1.0.sql
rename to vector--0.1.1.sql
index 8e7a064..9ae9887 100644
--- a/vector--0.1.0.sql
+++ b/vector--0.1.1.sql
@@ -14,10 +14,18 @@ CREATE FUNCTION vector_out(vector) RETURNS cstring
 CREATE FUNCTION vector_typmod_in(cstring[]) RETURNS integer
 	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT;
 
+CREATE FUNCTION vector_recv(internal, oid, integer) RETURNS vector
+	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT;
+
+CREATE FUNCTION vector_send(vector) RETURNS bytea
+	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT;
+
 CREATE TYPE vector (
 	INPUT     = vector_in,
 	OUTPUT    = vector_out,
-	TYPMOD_IN = vector_typmod_in
+	TYPMOD_IN = vector_typmod_in,
+	RECEIVE   = vector_recv,
+	SEND      = vector_send
 );
 
 -- functions
diff --git a/vector.control b/vector.control
index 588b75c..bf0bd4f 100644
--- a/vector.control
+++ b/vector.control
@@ -1,4 +1,4 @@
 comment = 'vector data type and ivfflat access method'
-default_version = '0.1.0'
+default_version = '0.1.1'
 module_pathname = '$libdir/vector'
 relocatable = true