0.9″ LED Remote Pet Training Collar – Black (2 x 4LR44/2 x AAA) Dimensions: 4.88 in x 1.73 in x 0.91 in (12.4 cm x 4.4 cm x 2.3 cm) Weight: 1.52 oz (43 g) Takes the following batteries: (2 x 4LR44/2 x AAA)