diff --git a/src/py21cmemu/properties.py b/src/py21cmemu/properties.py
index 09b0d45..b6569dd 100644
--- a/src/py21cmemu/properties.py
+++ b/src/py21cmemu/properties.py
@@ -7,44 +7,6 @@
 import numpy as np
 
 
-USER_PARAMS = {
-    "BOX_LEN": 250,
-    "DIM": 512,
-    "HII_DIM": 128,
-    "USE_FFTW_WISDOM": True,
-    "HMF": 1,
-    "USE_RELATIVE_VELOCITIES": False,
-    "POWER_SPECTRUM": 0,
-    "N_THREADS": 1,
-    "PERTURB_ON_HIGH_RES": False,
-    "NO_RNG": False,
-    "USE_INTERPOLATION_TABLES": True,
-    "FAST_FCOLL_TABLES": False,
-    "USE_2LPT": True,
-    "MINIMIZE_MEMORY": False,
-}
-
-COSMO_PARAMS = {
-    "SIGMA_8": 0.82,
-    "hlittle": 0.6774,
-    "OMm": 0.3075,
-    "OMb": 0.0486,
-    "POWER_INDEX": 0.97,
-}
-
-FLAG_OPTIONS = {
-    "USE_HALO_FIELD": False,
-    "USE_MINI_HALOS": False,
-    "USE_MASS_DEPENDENT_ZETA": True,
-    "SUBCELL_RSD": True,
-    "INHOMO_RECO": True,
-    "USE_TS_FLUCT": True,
-    "M_MIN_in_Mass": False,
-    "PHOTON_CONS": True,
-    "FIX_VCB_AVG": False,
-}
-
-
 class EmulatorProperties:
     """A class that contains the properties of the emulator."""
 
@@ -89,6 +51,43 @@ def __init__(self):
         self.UVLFs_err = all_emulator_numbers["UVLFs_err"]
         self.UVLFs_logerr = all_emulator_numbers["UVLFs_logerr"]
 
+        USER_PARAMS = {
+            "BOX_LEN": 250,
+            "DIM": 512,
+            "HII_DIM": 128,
+            "USE_FFTW_WISDOM": True,
+            "HMF": 1,
+            "USE_RELATIVE_VELOCITIES": False,
+            "POWER_SPECTRUM": 0,
+            "N_THREADS": 1,
+            "PERTURB_ON_HIGH_RES": False,
+            "NO_RNG": False,
+            "USE_INTERPOLATION_TABLES": True,
+            "FAST_FCOLL_TABLES": False,
+            "USE_2LPT": True,
+            "MINIMIZE_MEMORY": False,
+        }
+
+        COSMO_PARAMS = {
+            "SIGMA_8": 0.82,
+            "hlittle": 0.6774,
+            "OMm": 0.3075,
+            "OMb": 0.0486,
+            "POWER_INDEX": 0.97,
+        }
+
+        FLAG_OPTIONS = {
+            "USE_HALO_FIELD": False,
+            "USE_MINI_HALOS": False,
+            "USE_MASS_DEPENDENT_ZETA": True,
+            "SUBCELL_RSD": True,
+            "INHOMO_RECO": True,
+            "USE_TS_FLUCT": True,
+            "M_MIN_in_Mass": False,
+            "PHOTON_CONS": True,
+            "FIX_VCB_AVG": False,
+        }
+
         self.flag_options = FLAG_OPTIONS
         self.user_params = USER_PARAMS
         self.cosmo_params = COSMO_PARAMS
@@ -119,6 +118,45 @@ def __init__(self):
         self.mean_errors = np.load(
             here / "models/radio_background/median_test_errors.npz"
         )
+        USER_PARAMS = {
+            "BOX_LEN": 250,
+            "DIM": 512,
+            "HII_DIM": 128,
+            "USE_FFTW_WISDOM": True,
+            "HMF": 1,
+            "USE_RELATIVE_VELOCITIES": False,
+            "POWER_SPECTRUM": 0,
+            "N_THREADS": 1,
+            "PERTURB_ON_HIGH_RES": False,
+            "NO_RNG": False,
+            "USE_INTERPOLATION_TABLES": True,
+            "FAST_FCOLL_TABLES": False,
+            "USE_2LPT": True,
+            "MINIMIZE_MEMORY": False,
+        }
+
+        COSMO_PARAMS = {
+            "SIGMA_8": 0.82,
+            "hlittle": 0.6774,
+            "OMm": 0.3075,
+            "OMb": 0.0486,
+            "POWER_INDEX": 0.97,
+        }
+
+        FLAG_OPTIONS = {
+            "USE_HALO_FIELD": False,
+            "USE_MINI_HALOS": False,
+            "USE_MASS_DEPENDENT_ZETA": True,
+            "SUBCELL_RSD": True,
+            "INHOMO_RECO": True,
+            "USE_TS_FLUCT": True,
+            "M_MIN_in_Mass": False,
+            "PHOTON_CONS": True,
+            "FIX_VCB_AVG": False,
+        }
+        self.flag_options = FLAG_OPTIONS
+        self.user_params = USER_PARAMS
+        self.cosmo_params = COSMO_PARAMS
 
 
 def emulator_properties(emulator: str = "default") -> EmulatorProperties:
diff --git a/tests/test_main.py b/tests/test_main.py
index dc31b5b..6ea67a0 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -57,15 +57,21 @@ def test_output(tmp_path):
 
 def test_properties():
     """Test that the properties are loaded correctly."""
-    from py21cmemu.properties import emulator_properties as properties
+    from py21cmemu.properties import emulator_properties
 
+    properties = emulator_properties()
     properties.limits
 
+    properties = emulator_properties(emulator="radio_background")
+    properties.logTr_mean
+
 
 def test_inputs():
     """Test that we perform parameter normalization properly."""
     from py21cmemu import EmulatorInput
-    from py21cmemu.properties import emulator_properties as properties
+    from py21cmemu.properties import emulator_properties
+
+    properties = emulator_properties()
 
     emu_in = EmulatorInput()
     limits = properties.limits.copy()