public function form( $instance ) {
		$cb_display = isset( $instance['cb_display'] ) ? $instance['cb_display'] : array();
		// get all locations.
		$location_info = get_terms(
			array(
				'taxonomy'   => 'location',
				'fields'     => 'id=>name',
				'hide_empty' => false,
			)
		);
		$phones_table  = '<table><tbody>';

		// loop through each location, set up form.
		foreach ( $location_info as $term_id => $name ) {
			// Output a checkbox for every phone number in this location.
			for ( $p = 1; $p <= INVP::LOCATION_MAX_PHONES; $p++ ) {
				// Is there a phone number in this slot?
				$phone_uid = get_term_meta( $term_id, 'phone_' . $p . '_uid', true );
				if ( ! $phone_uid ) {
					// No, we're done with this location.
					break;
				}

				// Only do this once per location.
				if ( 1 == $p ) {
					$phones_table .= sprintf( '<tr><td colspan="3"><strong>%s</strong></td></tr>', esc_html( $name ) );
				}

				$number      = get_term_meta( $term_id, 'phone_' . $p . '_number', true );
				$description = get_term_meta( $term_id, 'phone_' . $p . '_description', true );
				$checkbox_id = $this->get_field_id( 'cb_display_' . $phone_uid );

				$cb_display_text = sprintf(
					'<input type="checkbox" id="%s" name="%s" value="%s"%s />',
					esc_attr( $checkbox_id ),
					esc_attr( $this->get_field_name( 'cb_display[' . $term_id . '][]' ) ),
					esc_attr( $phone_uid ),
					checked( ( isset( $cb_display[ $term_id ] ) && is_array( $cb_display[ $term_id ] ) && in_array( $phone_uid, $cb_display[ $term_id ], true ) ), true, false )
				);

				$phones_table .= sprintf(
					'<tr><td>%s</td><td><label for="%s">%s</label></td><td><label for="%s">%s</label></td></tr>',
					$cb_display_text,
					esc_attr( $checkbox_id ),
					esc_html( $description ),
					esc_attr( $checkbox_id ),
					esc_html( $number )
				);
			}
		}

		$phones_table .= '</tbody></table>';

		// Widget admin form.
		$title = isset( $instance['title'] ) ? $instance['title'] : '';
		?>
		<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>"><?php esc_html_e( 'Title (optional):', 'inventory-presser' ); ?></label>
			<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'title' ) ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" />
		</p>
		<p>
			<label for="<?php echo esc_attr( $this->get_field_id( 'format' ) ); ?>"><?php esc_html_e( 'Display Format:', 'inventory-presser' ); ?></label>
			<select class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'format' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'format' ) ); ?>">
		<?php
		$format = isset( $instance['format'] ) ? $instance['format'] : current( array_keys( $this->formats() ) );
		foreach ( $this->formats() as $key => $format_array ) {
			printf(
				'<option value="%s"%s>%s</option>',
				esc_attr( $key ),
				selected( $format == $key, true, false ),
				esc_html( $format_array['selector'] )
			);
		}
		?>
			</select>
		</p>
		<p><?php echo wp_kses_post( $phones_table ); ?></p>
		<?php
	}