diff --git a/cmd/daemon/daemon.go b/cmd/daemon/daemon.go
index 841c5ab..4c9cc1b 100644
--- a/cmd/daemon/daemon.go
+++ b/cmd/daemon/daemon.go
@@ -32,7 +32,7 @@ var daemonCmd = &cobra.Command{
 			log.Fatalf("Can not parse clean cache interval into duration time: %v", err)
 		}
 
-		logger := logger.NewDefaultLogger(logger.LogLevelDebug, false)
+		logger := logger.NewDefaultLogger(logger.LogLevelDebug)
 
 		measurementUnit, err := sensor.SelectTemperatureMeasurementUnit(temperatureUnit)
 		if err != nil {
diff --git a/pkg/logger/default.go b/pkg/logger/default.go
index baa48ef..45cf72e 100644
--- a/pkg/logger/default.go
+++ b/pkg/logger/default.go
@@ -38,20 +38,34 @@ func (dl *defaultLogger) Fatal(f string, v ...interface{}) {
 }
 
 func (dl *defaultLogger) log(ll LogLevel, f string, v ...interface{}) {
+
+	if dl.logLevel > ll {
+		return
+	}
+
 	layout := "2006/01/02 15:04:05"
 	dw := dl.stdout
-	switch dl.logLevel {
+	prefix := ""
+	switch ll {
+	case LogLevelDebug:
+		prefix = "DEBUG"
+	case LogLevelInfo:
+		prefix = "INFO"
+	case LogLevelWarn:
+		prefix = "WARN"
 	case LogLevelError:
+		prefix = "ERROR"
 		dw = dl.stderr
 	case LogLevelFatal:
+		prefix = "FATAL"
 		dw = dl.stderr
 	}
 	dl.mutex.Lock()
-	fmt.Fprintf(dw, "%v %v: %v \n", time.Now().Format(layout), ll, fmt.Sprintf(f, v...))
+	fmt.Fprintf(dw, "%v %v: %v\n", time.Now().Format(layout), prefix, fmt.Sprintf(f, v...))
 	dl.mutex.Unlock()
 }
 
-func NewDefaultLogger(logLevel LogLevel, time bool) *defaultLogger {
+func NewDefaultLogger(logLevel LogLevel) Logger {
 	return &defaultLogger{
 		logLevel: logLevel,
 		mutex:    new(sync.Mutex),
@@ -60,7 +74,16 @@ func NewDefaultLogger(logLevel LogLevel, time bool) *defaultLogger {
 	}
 }
 
-func NewSilentLogger() *defaultLogger {
+func NewCustomLogger(loglevel LogLevel, out io.Writer, err io.Writer) Logger {
+	return &defaultLogger{
+		logLevel: loglevel,
+		mutex:    new(sync.Mutex),
+		stdout:   out,
+		stderr:   err,
+	}
+}
+
+func NewSilentLogger() Logger {
 	return &defaultLogger{
 		logLevel: LogLevelDebug,
 		mutex:    new(sync.Mutex),
diff --git a/pkg/logger/default_test.go b/pkg/logger/default_test.go
new file mode 100644
index 0000000..dd28f54
--- /dev/null
+++ b/pkg/logger/default_test.go
@@ -0,0 +1,69 @@
+package logger_test
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"github.com/go-flucky/flucky/pkg/logger"
+	"github.com/stretchr/testify/require"
+)
+
+func TestLogger(t *testing.T) {
+	require := require.New(t)
+	stdoutBuffer := new(bytes.Buffer)
+	stderrBuffer := new(bytes.Buffer)
+
+	// LogLevelDebug
+	l := logger.NewCustomLogger(logger.LogLevelDebug, stdoutBuffer, stderrBuffer)
+	l.Debug("DEBUG")
+	require.NotEmpty(stdoutBuffer.Bytes())
+	require.Empty(stderrBuffer.Bytes())
+
+	stdoutBuffer.Reset()
+	stderrBuffer.Reset()
+
+	// LogLevelInfo
+	l = logger.NewCustomLogger(logger.LogLevelInfo, stdoutBuffer, stderrBuffer)
+
+	l.Debug("DEBUG")
+	require.Empty(stdoutBuffer.Bytes())
+	require.Empty(stderrBuffer.Bytes())
+
+	stdoutBuffer.Reset()
+	stderrBuffer.Reset()
+
+	l.Info("INFO")
+	require.NotEmpty(stdoutBuffer.Bytes())
+	require.Empty(stderrBuffer.Bytes())
+
+	stringArray := strings.Split(stdoutBuffer.String(), ": ")
+	require.Equal(2, len(stringArray))
+	require.Equal("INFO\n", stringArray[1])
+
+	stdoutBuffer.Reset()
+	stderrBuffer.Reset()
+
+	// LogLevelWarn
+	l = logger.NewCustomLogger(logger.LogLevelWarn, stdoutBuffer, stderrBuffer)
+	l.Warn("WARN")
+	require.NotEmpty(stdoutBuffer.Bytes())
+	require.Empty(stderrBuffer.Bytes())
+
+	stringArray = strings.Split(stdoutBuffer.String(), ": ")
+	require.Equal(2, len(stringArray))
+	require.Equal("WARN\n", stringArray[1])
+
+	stdoutBuffer.Reset()
+	stderrBuffer.Reset()
+
+	// LogLevelError
+	l = logger.NewCustomLogger(logger.LogLevelError, stdoutBuffer, stderrBuffer)
+	l.Error("ERROR")
+	require.Empty(stdoutBuffer.Bytes())
+	require.NotEmpty(stderrBuffer.Bytes())
+
+	stringArray = strings.Split(stderrBuffer.String(), ": ")
+	require.Equal(2, len(stringArray))
+	require.Equal("ERROR\n", stringArray[1])
+}
diff --git a/pkg/logger/loglevel.go b/pkg/logger/loglevel.go
index 9a6ed21..71ecfbf 100644
--- a/pkg/logger/loglevel.go
+++ b/pkg/logger/loglevel.go
@@ -1,11 +1,11 @@
 package logger
 
-type LogLevel string
+type LogLevel int
 
 const (
-	LogLevelDebug LogLevel = "DEBUG"
-	LogLevelInfo  LogLevel = "INFO"
-	LogLevelWarn  LogLevel = "WARN"
-	LogLevelError LogLevel = "ERROR"
-	LogLevelFatal LogLevel = "FATAL"
+	LogLevelDebug LogLevel = iota + 1
+	LogLevelInfo
+	LogLevelWarn
+	LogLevelError
+	LogLevelFatal
 )